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Hydraulic punch tool for heat exchangers
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Patent number 4,730,392
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Issue date Mar 15, 1988
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Chevron Research Company
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Jackie C. Allen
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Hydraulic punch tool for heat exchangers
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Patent number 4,597,180
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Issue date Jul 1, 1986
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Chevron Research Company
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Jackie C. Allen
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Tubing perforator
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Patent number 4,499,749
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Issue date Feb 19, 1985
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The Dow Chemical Company
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Robert A. Hay
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Pipe perforating machine
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Patent number 4,052,880
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Issue date Oct 11, 1977
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Foulks; Noah E.
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Robert L. Cullinan
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3811352
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Patent number 3,811,352
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Issue date May 21, 1974
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3782157
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Patent number 3,782,157
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Issue date Jan 1, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3681964
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Patent number 3,681,964
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Issue date Aug 8, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3680422
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Patent number 3,680,422
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Issue date Aug 1, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3376725
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Patent number 3,376,725
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Issue date Apr 9, 1968
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3289511
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Patent number 3,289,511
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Issue date Dec 6, 1966
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3271988
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Patent number 3,271,988
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Issue date Sep 13, 1966
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3259003
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Patent number 3,259,003
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Issue date Jul 5, 1966
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2983167
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Patent number 2,983,167
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Issue date May 9, 1961
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2783840
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Patent number 2,783,840
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Issue date Mar 5, 1957
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2374031
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Patent number 2,374,031
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Issue date Apr 17, 1945
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2204273
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Patent number 2,204,273
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Issue date Jun 11, 1940
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1764129
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Patent number 1,764,129
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Issue date Jun 17, 1930
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1586311
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Patent number 1,586,311
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Issue date May 25, 1926
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1521866
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Patent number 1,521,866
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Issue date Jan 6, 1925
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1500829
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Patent number 1,500,829
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Issue date Jul 8, 1924
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1487242
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Patent number 1,487,242
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Issue date Mar 18, 1924
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1457193
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Patent number 1,457,193
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Issue date May 29, 1923
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1432073
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Patent number 1,432,073
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Issue date Oct 17, 1922
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1398320
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Patent number 1,398,320
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Issue date Nov 29, 1921
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...