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Patents > Year granted: 1919 & Office : AH or BE or CL or DEG or HU or IT or NL & IPCs: None

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construction (12) · Airship (12) · frame (10) · design (9) · airplane (8) · LTA (6) · propellers (5) · texture (4) · instrument (3) · subsystem (3) · fuselage (3) · safety (3) · control (3) · electricity (2) · stability (2) · military (2) · Balloons (2) · Wood (2) · gas (2)
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Showing below up to 36 results in range #1 to #36.

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