Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4261068 | Reinforcement in a honeycomb foundation A welded wire openwork mesh as a reinforcement for honeycomb foundation in a honeycomb frame provides strength against stretching, sagging, bulging or buckling, and support of honeycomb in the frame allowing rapid centrifuging without breakage.... | 04/14/1981 |