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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5575241 | Animal exercise and amusement device An animal exercise and amusement device includes a vertical post and a hollow shank with an eye that is rotatably attached to the top of the post. One end of a rope or elastic cord is attached through the hollow shank outwardly terminating at the other en... | 11/19/1996 |
| 4747372 | Tether apparatus The animal tether comprises an upright tube connected at an upper end to the end of a lateral tube. The apparatus is rotatably mounted on a base member upstanding shaft. Extending outwardly of the tubes a tether line together with a leash line is attached... | 05/31/1988 |
