Theo's Mechanische Aap
Alexander Gogelweg 12
2517 JH Den Haag
 
Oosterdiep Oostzijde 96
7881 CV Emmer-Compascuum, NL
 

web: https://mechanicape.nl
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Ralph Steiner mechanical principles (1930)

rein zo, 02/20/2011 - 01:00

Mechanische principes door Ralph Steiner (1930)

http://www.youtube.com/watch?v=Y5pen3QMgzQ