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2811732
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Issue date Nov 5, 1957
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G04 - HOROLOGY
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2738110
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Patent number 2,738,110
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Issue date Mar 13, 1956
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G04 - HOROLOGY
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2738031
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Patent number 2,738,031
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Issue date Mar 13, 1956
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G04 - HOROLOGY
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2656070
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Patent number 2,656,070
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Issue date Oct 20, 1953
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2643801
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Patent number 2,643,801
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Issue date Jun 30, 1953
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G04 - HOROLOGY