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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4318345 | Railway vestibule connection A vestibule connection for the adjoining ends of two cars of a rapid-transit vehicle includes an apron which is maintained centered in the space between turntables at the adjoining ends, by being mounted on two transverse parallel shafts via telescopable ... | 03/09/1982 |
| 4211173 | End construction for a railway car A pair of collision posts are connected at the end of a railway car between the roof structure and buffer sill. Each of the posts includes a tubular structure formed by welding two elongated "S" shaped strips to an elongated flat strip. Each of the tubula... | 07/08/1980 |
