AT 20
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Eisenbahnbetrieb (railway propulsion).
Used to classify a patent in which a captive balloon pulls a mountain trolley.
Enclosing categories | Austrian patent classifications |
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This wiki has 1 patents in category "AT 20".
Patents in category AT 20
- Patent AT-1900-1681 (English title: Hanging mountain conveyance powered by captive balloon, Inventors: Heinrich Suter, Supplementary to patent: Patent CH-1899-18667, Filing date: 1899-04-11)