Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6306028 | Head meat recovery Apparatus for recovering meat from the head of a slaughtered animal. A jaw support clamps and supports the head by clamping the jaw. Cheek pullers having clamps engage with and hold the cheeks of the animal head in the vicinity of the mouth. A drive arran... | 10/23/2001 |
| 5326309 | Animal evisceration A process of eviscerating an inverted animal carcass (10) inclined at 35° to 40° includes pushing the viscera (30) comprising both the thoracic viscera (31) and abdominal viscera (32) in a direction (B) from the cranial end (11) of the carcass (10) towa... | 07/05/1994 |