Drilldown: Patents
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- Publications (24577)
- Techtypes (2416)
Patents > Year granted:
1870 - 1879
& Supplementary to patent :
Patent GB-1909-12556 or
Patent US-1890-439421 or
None
& National tech categories :
DE 77 or
USPC 244/30
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airship (1) ·
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