JF Ptak Science Books: Calendrical Patents, Lumpy and Lean, 1864-1897

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Calendrical Patents, Lumpy and Lean, 1864-1897

JF Ptak Science Books Quick Post

I found these patents for calendars and calendar/clock improvements to be very interesting--particularly so for the simple, wooden examples with the hundreds of blocky, placeable elements (as seen in the first image):

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Posted by John F. Ptak in Patents, Technology, History of | Permalink

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