Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7104478 | Material spreading device A material spreading device for spreading material over a targeted area includes a receiving portion for receiving a plurality of bags of material, a hopper assembly and a material moving device. The material spreading device is configured for use on a vehicle. The ... | 09/12/2006 |