Drilldown: Techtypes
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Enclosing categories:
None (447) ·
USPC (158) ·
Simple tech terms (151) ·
USPC 244 (71) ·
CPC Y10S (43) ·
USPC 102 (33) ·
CPC B64D/62 (26) ·
French patent classifications (21) ·
propulsion (16) ·
USPC 114 (15) ·
GB 4 (15) ·
German patent classifications (14) ·
CPC B64C39/00 (14) ·
LTA (13) ·
USPC 89 (12) ·
Swiss patent classifications, 1908-1920 (11) ·
DE 77h (11) ·
CPC B64B1/00 (11) ·
airplane (11)
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