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Mechanical Pencil Calculator?
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02-08-2022, 09:55 PM
Post: #3
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RE: Mechanical Pencil Calculator?
Here's the patent for it...
https://patents.google.com/patent/US2777636A/en You can read his description of the invention, and if you click on the image a couple of times and enlarge it, it's a pretty good resolution .png file... mike ENTER > = |
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| Messages In This Thread |
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Mechanical Pencil Calculator? - ndzied1 - 02-08-2022, 08:55 PM
RE: Mechanical Pencil Calculator? - Ren - 02-08-2022, 09:08 PM
RE: Mechanical Pencil Calculator? - trojdor - 02-08-2022 09:55 PM
RE: Mechanical Pencil Calculator? - bbergman - 02-09-2022, 04:27 PM
RE: Mechanical Pencil Calculator? - Dave Britten - 02-09-2022, 05:39 PM
RE: Mechanical Pencil Calculator? - bbergman - 02-09-2022, 05:41 PM
RE: Mechanical Pencil Calculator? - Dave Britten - 02-09-2022, 05:45 PM
RE: Mechanical Pencil Calculator? - KeithB - 02-14-2022, 03:22 PM
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