Did You Know...
...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 |
| 4061069 | Chord locater for fretted musical instrument A device mounted on the fretboard of a stringed musical instrument for quickly locating and playing simple and complex chords. The device includes a keyboard having a plurality of reciprocable buttons arranged in adjacent rows along the frets overlying th... | 12/06/1977 |
| 4023460 | Intonation aid for the violin, viola and cello and other instruments of the violin family An intonation aid for instruments of the violin family is molded from a plastic material as a thin, curved member which fits over the fingerboard. The aid includes a plurality of spaced stops arranged at different acute angles transverse to the strings th... | 05/17/1977 |
