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Forming openings in pipes
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Patent number 5,711,351
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Issue date Jan 27, 1998
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Douglas John Wheatley
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3841815
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Patent number 3,841,815
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Issue date Oct 15, 1974
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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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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3703116
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Patent number 3,703,116
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Issue date Nov 21, 1972
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B26 - HAND CUTTING TOOLS CUTTING SEVERING
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3678718
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Patent number 3,678,718
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Issue date Jul 25, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3391424
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Patent number 3,391,424
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Issue date Jul 9, 1968
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2834983
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Patent number 2,834,983
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Issue date May 20, 1958
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2600254
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Patent number 2,600,254
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Issue date Jun 10, 1952
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2072782
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Patent number 2,072,782
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Issue date Mar 2, 1937
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B26 - HAND CUTTING TOOLS CUTTING SEVERING