Joke Buzzer Patent

Autor/Urheber:

Soren Adams

Shortlink:

https://dewiki.de/b/11feba

Quelle:

Wikimedia Commons

Größe:

768 x 1047 Pixel (176876 Bytes)

Beschreibung:

Diagram of the first joke buzzer, later joy buzzer, from United States patent application 1845735, by Soren Sorensen Adams.

Lizenz:

Public domain

Credit:

http://www.google.com/patents?id=AM9GAAAAEBAJ&pg=PA1

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