Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4334583 | Multi-purpose light duty garden tool A light-weight, multi-purpose light-duty yard tool made with a small sheet metal blade part shaped like a truncated triangle with the widest part at the front and the narrow edge at the heel or rear end. The front side portions are slightly cupped as is t... | 06/15/1982 |