Drilldown: Patents
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Patents > Office :
AU or
DE or
Other
& Grant date:
1930 - 1939
& Supplementary to patent:
None
& National tech categories :
USPC 244/3.23 or
USPC 244/80 or
None
& Number of text pages:
None
Use the filters below to narrow your results.
Showing below up to 1 result in range #1 to #1.