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| All Patents in class 73/1.56 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,271,340 | Jan. 27, 1942 | I. Jacobson | Shutter and Flash Synchronizer for Cameras | ||
| 2,353,896 | Jul. 18, 1944 | J.A. Sprague | Photographic Synchronizer Testing Equipmqnt | ||
| 2,353,897 | Jul. 18, 1944 | J.A. Sprague | Sensitized Material Holder or Carrier for Photographic Synchronizer Testing Equipment | ||
| 5,610,327 | Mar. 11, 1997 | M.M. Crass, M.A. Hoferitza, T.P. Becker | Knock Sensor-Triggered Timing Light with Visible Laser Retro-Reflecting Control | ||