3 ms·
try Lego: http://aleptu.com/images/2009/04/lego_difference_engine.jpg http://aleptu.com/images/2009/04/lego_difference_engine.jpg
by raganwald 16y ago
try Lego: http://aleptu.com/images/2009/04/lego_difference_engine.jpg http://aleptu.com/images/2009/04/lego_difference_engine.jpg