Drilldown: Patents
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Patents > Office :
?? or
BE or
DE or
IT or
NZ
& Filing date:
1900 - 1909
& Grant date:
1911
& National tech categories :
USPC 244/30 or
None
& Number of figures:
None
Use the filters below to narrow your results.
Showing below up to 3 results in range #1 to #3.