Drilldown: Patents
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Patents > Filing date:
1850 - 1859
& National tech categories :
DE 77h or
FR 6.4 or
USPC 244/3.23
& Cites these patents :
1887 or
1910 or
Patent AT-1909-47911 or
Patent GB-1912-5966 or
USPC 244/26
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