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James McLean is issued a patent for a piano.
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| Number | Title | Issue Date |
| 4852047 | Continuous flow chart, improved data format and debugging system for programming and operation of machines An improved machine programming and control system includes the utilization of a continuous, multiple-block, flow chart or charts, all or a portion of which is displayed. Each entered flow chart is executed without conversion to other languages, such that... | 07/25/1989 |
