Drilldown: Patents
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- Patents (17547)
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- Publications (24562)
- Techtypes (2373)
Patents > Year granted:
1900 - 1909
& National tech categories :
DE 77h.9 or
HU V/h or
USPC 244/30
& Number of text pages:
None
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Showing below up to 10 results in range #1 to #10.