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Merging discrete time signals
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Patent number 11,107,297
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Issue date Aug 31, 2021
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Simmonds Precision Products, Inc.
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Alan M. Duke
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G07 - CHECKING-DEVICES
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Worker management system
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Patent number 10,777,023
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Issue date Sep 15, 2020
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Hitachi Construction Machinery Co., Ltd.
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Mariko Mizuochi
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G06 - COMPUTING CALCULATING COUNTING
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Time recorder
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Patent number 7,839,426
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Issue date Nov 23, 2010
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Seiko Precision Inc.
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Koji Ebara
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3436732
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Patent number 3,436,732
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Issue date Apr 1, 1969
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G07 - CHECKING-DEVICES
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3419877
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G07 - CHECKING-DEVICES
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2868612
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G07 - CHECKING-DEVICES
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2616778
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G07 - CHECKING-DEVICES
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1952991
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Patent number 1,952,991
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Issue date Mar 27, 1934
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G07 - CHECKING-DEVICES
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1781740
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Patent number 1,781,740
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Issue date Nov 18, 1930
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G07 - CHECKING-DEVICES