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Manufacture of bearings
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Patent number 4,117,580
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Issue date Oct 3, 1978
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Friedrich Heck
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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3608170
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Patent number 3,608,170
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Issue date Sep 28, 1971
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B22 - CASTING POWDER METALLURGY
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3598171
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Patent number 3,598,171
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Issue date Aug 10, 1971
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B22 - CASTING POWDER METALLURGY
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3206807
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Patent number 3,206,807
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Issue date Sep 21, 1965
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B22 - CASTING POWDER METALLURGY
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3151369
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Patent number 3,151,369
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Issue date Oct 6, 1964
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B22 - CASTING POWDER METALLURGY
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3059282
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Patent number 3,059,282
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Issue date Oct 23, 1962
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B22 - CASTING POWDER METALLURGY
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2887744
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Patent number 2,887,744
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Issue date May 26, 1959
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B22 - CASTING POWDER METALLURGY
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2871528
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Patent number 2,871,528
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Issue date Feb 3, 1959
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B22 - CASTING POWDER METALLURGY
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2611161
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Patent number 2,611,161
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Issue date Sep 23, 1952
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B22 - CASTING POWDER METALLURGY
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2498873
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Patent number 2,498,873
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Issue date Feb 28, 1950
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2281246
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Patent number 2,281,246
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Issue date Apr 28, 1942
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2252351
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Patent number 2,252,351
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Issue date Aug 12, 1941
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B22 - CASTING POWDER METALLURGY
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2227500
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Patent number 2,227,500
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Issue date Jan 7, 1941
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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2219471
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Patent number 2,219,471
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Issue date Oct 29, 1940
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2164737
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Patent number 2,164,737
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Issue date Jul 4, 1939
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2145460
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Patent number 2,145,460
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Issue date Jan 31, 1939
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2080170
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Patent number 2,080,170
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Issue date May 11, 1937
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2000692
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Patent number 2,000,692
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Issue date May 7, 1935
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1964647
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Patent number 1,964,647
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Issue date Jun 26, 1934
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B22 - CASTING POWDER METALLURGY
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1956468
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Patent number 1,956,468
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Issue date Apr 24, 1934
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B22 - CASTING POWDER METALLURGY
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1956462
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Patent number 1,956,462
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Issue date Apr 24, 1934
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B22 - CASTING POWDER METALLURGY
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1945294
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Patent number 1,945,294
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Issue date Jan 30, 1934
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1944460
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Patent number 1,944,460
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Issue date Jan 23, 1934
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B22 - CASTING POWDER METALLURGY
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1944609
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Patent number 1,944,609
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Issue date Jan 23, 1934
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B22 - CASTING POWDER METALLURGY
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1944461
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Patent number 1,944,461
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Issue date Jan 23, 1934
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B22 - CASTING POWDER METALLURGY