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3613713
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E03 - WATER SUPPLY SEWERAGE
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2508294
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Patent number 2,508,294
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B61 - RAILWAYS
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2480480
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Patent number 2,480,480
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B61 - RAILWAYS
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2412118
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B61 - RAILWAYS
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2110927
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Patent number 2,110,927
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B61 - RAILWAYS
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1613908
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1557816
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B61 - RAILWAYS
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1290636
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B61 - RAILWAYS
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1184554
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B61 - RAILWAYS
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1060047
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B61 - RAILWAYS
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932824
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Patent number 932,824
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901922
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Patent number 901,922
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E03 - WATER SUPPLY SEWERAGE
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872655
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808010
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B61 - RAILWAYS
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789685
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B61 - RAILWAYS
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646606
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B61 - RAILWAYS
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645981
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B61 - RAILWAYS
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640486
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Patent number 640,486
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493658
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251767
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E03 - WATER SUPPLY SEWERAGE
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233104
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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196368
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179217
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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132391
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B61 - RAILWAYS