DE 77h.12
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Written on the originals as "Klasse 77h gruppe 12." We don't know the meaning or intended coverage of this group 12.
References
This wiki has 4 patents in category "DE 77h.12".
Patents in category DE 77h.12
- Patent DE-1905-175273 (English title: Ventilation and control device for airships, Inventors: M. J. Wiessing, Filing date: 1905-10-19)
- Patent DE-1907-214855 (English title: Airship with propulsion system working through ducts, Inventors: Joseph Albert Rignon, Filing date: 1907-03-11)
- Patent DE-1909-228654 (English title: Apparatus for climbing and reaching into the air by the recoil of exploding gas mixtures, Inventors: Christopher Antoonovich, Filing date: 1909-02-21)
- Patent DE-1913-330014 (English title: Ejector producing a stream of gas to propel airplanes and other devices, Inventors: Louis-Adolphe Hayot, Supplementary to patent: Patent FR-1912-458772, Filing date: 1913-07-24)
| Enclosing categories | German patent classifications, DE 77h |
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