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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5050815 | Compact safety belt retractor A compact safety belt retractor is provided with a large coil of webbing on a rotatable reel and locking pawl teeth are able to have locking engagement with toothed wheels on the reel even when the coil of webbing has a larger diameter than the diameter o... | 09/24/1991 |
| 4997140 | Retractor with auxiliary brake mechanism A safety belt retractor in which the reel is supported on a movable frame which cooperates with a braking mechanism such that when the reel locks, subsequent belt tension displaces the movable frame into camming engagement with a pivoting braking mechanis... | 03/05/1991 |
| 4984752 | Safety belt retractor and method of manufacture A seat belt retractor that is sensitive to vehicle movements is provided, having a frame for mounting a reel about which the safety belt is wound. A frame also mounts a pawl which selectively blocks rotation of the reel to prevent payout of a seat belt wh... | 01/15/1991 |
| 4979764 | Free-falling tip with full locking A free-falling, self-locking adjustable tip assembly is provided for a safety belt apparatus, which has a seat belt retractor at one belt end and for rewinding the belt and pulling one belt portion into a generally vertical position at belt release. A tip... | 12/25/1990 |
| 4976474 | Selective active overt comfort system A tensionless apparatus for a seat belt and/or shoulder harness retractor assembly is provided, which requires activation of a manual overt actuator and subsequent manual belt protraction to engage the tensionless mode from a release state. The tensionles... | 12/11/1990 |
| 4919450 | Overt comfort system A seat belt retractor system for restraining a passenger in a vehicle is provided with a tension-relieving means engageable by a manual overt actuator, which system includes the following: initiation of the tensionless mode requires conscious actuation by... | 04/24/1990 |
