Drilldown: Patents
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Patents > Office :
AT or
CH or
LU or
MX
& Grant date:
December 16, 1912
& Supplementary to patent :
Patent FR-1911-426850 or
Patent US-1913-04-21 George Raymond Lawrence
& National tech categories :
CH 79i or
USPC 244/22
& First filing :
Yes or
Other
Use the filters below to narrow your results.
Showing below up to 1 result in range #1 to #1.