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Spark plug construction
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Patent number 3,940,649
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Issue date Feb 24, 1976
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Francis E. Berstler
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H01 - BASIC ELECTRIC ELEMENTS
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3389287
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Patent number 3,389,287
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Issue date Jun 18, 1968
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H01 - BASIC ELECTRIC ELEMENTS
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3320461
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Patent number 3,320,461
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Issue date May 16, 1967
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H01 - BASIC ELECTRIC ELEMENTS
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2399299
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Patent number 2,399,299
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Issue date Apr 30, 1946
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H01 - BASIC ELECTRIC ELEMENTS
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2142383
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Patent number 2,142,383
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Issue date Jan 3, 1939
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H01 - BASIC ELECTRIC ELEMENTS
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1972351
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Patent number 1,972,351
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Issue date Sep 4, 1934
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H01 - BASIC ELECTRIC ELEMENTS
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1797731
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Patent number 1,797,731
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Issue date Mar 24, 1931
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H01 - BASIC ELECTRIC ELEMENTS
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1573316
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Patent number 1,573,316
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Issue date Feb 16, 1926
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H01 - BASIC ELECTRIC ELEMENTS
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1519707
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Patent number 1,519,707
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Issue date Dec 16, 1924
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H01 - BASIC ELECTRIC ELEMENTS
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1430429
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Patent number 1,430,429
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Issue date Sep 26, 1922
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H01 - BASIC ELECTRIC ELEMENTS
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1370789
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Patent number 1,370,789
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Issue date Mar 8, 1921
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H01 - BASIC ELECTRIC ELEMENTS
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1344954
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Patent number 1,344,954
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Issue date Jun 29, 1920
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H01 - BASIC ELECTRIC ELEMENTS
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1332904
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Patent number 1,332,904
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Issue date Mar 9, 1920
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H01 - BASIC ELECTRIC ELEMENTS