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| Number | Title | Issue Date |
| 4303926 | Chart drive mechanism In the preferred and illustrated embodiment of a recording device, a fluid volume driven chart bracket is disclosed. The bracket is rotationally responsive to fluid flow through a pipeline or the like. A recording chart is rotated by the fluid flowing thr... | 12/01/1981 |
| 4259677 | Method and apparatus for recording the compression pressure of internal combustion engines An apparatus and method for recording the compression pressure of internal combustion engines, wherein a pair of recording elements, such as a stylus and a recording sheet, are movable relative to each other by a pressure sensitive element, and the compre... | 03/31/1981 |
| 4180821 | Motion tape recorder An instrument attached to a workpiece at two separated locations or between two members to record movement. It is a mechanical strain or motion recorder. It is driven by the strains or movements being recorded. The record of the movements is made on a cas... | 12/25/1979 |
| 4093954 | Motion recorder indicator A recorder-indicator which mechanically magnifies strain or movement using special flex pivots. The lever system is activated by the motions being recorded or observed. A pointer indicates the strain or movement. It also marks or scribes a record of maxim... | 06/06/1978 |
| 4040062 | Recording instrument A scratch strain gauge has an annular target removably supported on a first plate, which is fixed to a first area of a structure that is to have its strains recorded. The target, which has a groove in its periphery, is driven by flat springs, supported on... | 08/02/1977 |
