Drilldown: Patents

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Patents > Year filed: 1900 - 1909 & Inventor country : DE or NL & Applicant is inventor: No

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Tech fields:
LTA (20) · airship (7) · Navigation (6) · Subsystem (5) · stability (5) · None (4) · balloon (4) · Design (4) · instrument (4) · aerodynamics (3) · valve (3) · pressure (3) · Lift (3) · Construction (3) · Control (3) · safety (3) · frame (3) · dirigibles (3)
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