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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Patent number 3,406,800
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1959017
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Patent number 1,959,017
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Patent number 1,866,248
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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G01 - MEASURING TESTING
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1557957
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Patent number 1,557,957
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1362452
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B61 - RAILWAYS