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Method for producing a glow plug
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Patent number 7,020,952
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Issue date Apr 4, 2006
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NGK Spark Plug Co., Ltd.
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Shindo Watanabe
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Method of making a spark plug
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Patent number 6,923,699
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Issue date Aug 2, 2005
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NGK Spark Plug Co., Ltd.
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Yoshihiro Matsubara
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H01 - BASIC ELECTRIC ELEMENTS
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2320452
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Patent number 2,320,452
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Issue date Jun 1, 1943
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2254494
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Patent number 2,254,494
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Issue date Sep 2, 1941
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H01 - BASIC ELECTRIC ELEMENTS
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2052356
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Patent number 2,052,356
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Issue date Aug 25, 1936
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1948466
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Patent number 1,948,466
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Issue date Feb 20, 1934
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1920265
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Patent number 1,920,265
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Issue date Aug 1, 1933
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1920266
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Patent number 1,920,266
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Issue date Aug 1, 1933
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1920264
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Patent number 1,920,264
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Issue date Aug 1, 1933
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1901459
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Patent number 1,901,459
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Issue date Mar 14, 1933
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1878575
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Patent number 1,878,575
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Issue date Sep 20, 1932
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1697620
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Patent number 1,697,620
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Issue date Jan 1, 1929
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1511202
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Patent number 1,511,202
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Issue date Oct 7, 1924
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H01 - BASIC ELECTRIC ELEMENTS
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1482687
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Patent number 1,482,687
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Issue date Feb 5, 1924
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1383675
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Patent number 1,383,675
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Issue date Jul 5, 1921
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H01 - BASIC ELECTRIC ELEMENTS
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1173214
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Patent number 1,173,214
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Issue date Feb 29, 1916
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H01 - BASIC ELECTRIC ELEMENTS