Drilldown: Patents
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Patents > Office
:
AT
or
DE
or
MX
& Inventor country
:
AT
or
DE
& Grant date:
1890 - 1899
& Assigned to:
None
& National tech categories
:
AT 37c
or
FR 6.4
or
IT 8
or
USPC 244/90R
or
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