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A working model of WHAT ?? That would help us answer your question...

A few simple thoughts would be a Lego or Erector-set kit that would permit you to build a crane or tram or electomagnet-crane.

You could also go to a model railroad shop and buy a turntable or cantilever bridge model (around $15-40USD)

Good luck !!

2007-05-27 10:03:51 · answer #1 · answered by mariner31 7 · 0 0

Check out some of these:

http://www.sciplus.com/category.cfm?subsection=2&category=19

2007-05-27 08:40:24 · answer #2 · answered by strech 7 · 0 0

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