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3540107
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Patent number 3,540,107
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Issue date Nov 17, 1970
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
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2481777
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Patent number 2,481,777
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Issue date Sep 13, 1949
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2014892
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Patent number 2,014,892
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Issue date Sep 17, 1935
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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1760231
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Patent number 1,760,231
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Issue date May 27, 1930
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES