Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6485205 | Media weight sensor using an acoustic resonator This invention relates to a media weight sensor of the type that includes a transducer consisting of a metal desk with a piezoelectric element fabricated by one side which form the back of a Helmholtz resonator cavity mounted in a printer so that the medi... | 11/26/2002 |