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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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):