Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5752257 | Redundant array of removable cartridge disk drives A memory system comprises an array of parallel removable hard disk cartridges and matching drives. Each cartridge is recorded with an array position signature so that an array can be programmatically reconstructed each time the cartridges are loaded in th... | 05/12/1998 |