...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4596074 | Curvilinear measuring device, and methods of constructing and utilizing same A curvilinear measuring device having a base plate containing a retaining tapered track in which a slide member moves. On top of the slide member is a digital readout device with a lit LCD on top. The slide device can be removed in turn end for end for ma... | 06/24/1986 |