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2181830
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Patent Grant
2181830
References
Source
Patent Number
2,181,830
Date Filed
Not available
Date Issued
Tuesday, November 28, 1939
85 years ago
CPC
B43K1/01 - with ink reservoirs
G01K1/02 - Special applications of indicating or recording means
G01L19/10 - mechanical
US Classifications
346 - Recorders
033 - Geometrical instruments
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