Privilege on a counting shell issued to music teacher Kummer on March 29, 1847 for 10 years

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    I continue to publish Russian privileges on computers. The second of the patents known to me (and not only to me - the device was very popular, it used a good hundred years). Source: Journal of Manufactures and Trade, 1847, No. 4-5.

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    PS This is how counting shells of Kummer, produced in Europe after more than half a century, already under other names, looked like.

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