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Mark Twain Forum <[log in to unmask]>
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Dave Davis <[log in to unmask]>
Date:
Sun, 12 Nov 2017 11:03:09 -0500
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Mark Twain Forum <[log in to unmask]>
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Anyone could (and did) emulate it, once the patent expired. I have a
scrapbook of similar make, bought in the 1970's.


It was a very good, useful & practicable  idea, and he did well with it.


DDD

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