Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4426164 | Line spacer for metal stamping devices An adjustable gearless line spacer for use with metal stamping typewriter apparatuses where it is desirous to uniformly space each line of type through a simple lever actuation, and to be able to conveniently adjust and preset the spacing between lines of... | 01/17/1984 |