Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6101484 | Dynamic market equilibrium management system, process and article of manufacture A dynamic market equilibrium management system is especially adapted for the sale of goods and services through an online buying group (referred to herein as a "co-op`) formed for the specific purpose of purchasing a particular product at (102) by definin... | 08/08/2000 |