DE454288C
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Clear checking device for typewriters with a transverse counter
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GB253408A
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Improvements in combined typewriting and computing machines
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DE445536C
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Typewriter with jumping transverse counter and clear character key
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US1737586A
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Combined typewriting and computing machine
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DE455557C
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Typewriter with switchable arithmetic unit and color changing unit
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GB247080A
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Improvements in computing and recording machines
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US1587304A
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Computing and recording machine
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US1519328A
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Calculating machine
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US1734538A
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Calculating machine
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US1378047A
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Typewriting and calculating machine
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CA258625A
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Computing and recording machine
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CA265553A
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Computing machine
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CA269098A
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Typewriter and computer
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