AT 20

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)