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Posted by James (172.203.54.22) on 26/12/06 I am in possession of a drawing tool. The box is marked "The Stereograph. Dr. Gengnagel's Patent. Made in Germany". It is a drawing tool of some kind with a small pencil attached via a sliding assembly to some rods, some of which run in a track (a very poor description but if you are familiar with item no doubt you will recognise it). My question is what does it do and how does it work? I've searched the web but with no luck. Many thanks in advance if you can help.
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