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3633818
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G06 - COMPUTING CALCULATING COUNTING
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3430854
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G07 - CHECKING-DEVICES
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3075697
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G07 - CHECKING-DEVICES
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2962210
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G07 - CHECKING-DEVICES
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2814028
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2747173
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2616622
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G07 - CHECKING-DEVICES
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2583182
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2430473
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Patent number 2,430,473
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G07 - CHECKING-DEVICES
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2365435
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2347425
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2195807
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2194273
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Patent number 2,194,273
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G07 - CHECKING-DEVICES
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1854514
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G07 - CHECKING-DEVICES
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1763821
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Patent number 1,763,821
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G07 - CHECKING-DEVICES