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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5907913 | Device for reducing knee stress when climbing and descending stairs and method of use A device and method of use for reducing knee bend, and therefore knee stress, when climbing and descending stairs. The method includes a first step of removably securing to a first foot of a user a device having an elevation of approximately half a step r... | 06/01/1999 |
| 4803989 | Full width metatarsal pad Metatarsal pad structured with relation to the foot for which it is intended so that it bridges across the width of the five metatarsal bones; a configuration at the front is such that each metatarsal is supported just posteriorly of the head thereof and ... | 02/14/1989 |
