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| Number | Title | Issue Date |
| 5656801 | System and a method for counting people A system and a method for counting the number of people passing a entry point in a predetermined direction. The system includes a foot-activated, pressure sensitive platform deployed at the entry point for providing a time-dependent pressure profile vecto... | 08/12/1997 |
| 4925188 | Toy race track and lap counter A toy race track and lap counter comprising a track with adjacent lanes each forming a complete circuit and racing objects which are propelled around the track by pressurized air controllably discharging from separate nozzles in a propulsion tower. Separa... | 05/15/1990 |
| 4223887 | Exercise supervision device An exercise supervision device for recording the number of footsteps taken by a jogger while running in place on the device includes a linearly depressible jogging surface and a rotatively operable counter and structure directly connecting the jogging sur... | 09/23/1980 |
| 4175446 | Step counting device and method The number of steps taken while walking are counted by straining a fatigue life gauge to change its electrical resistance each time the device is stepped on by a subject. The change in resistance of the fatigue life gauge is measured to ascertain the appr... | 11/27/1979 |
| 4056265 | Machine for indoor running An indoor running machine comprising a machine body having a drum accommodating section formed at the front edge; a vertically movable footboard provided on top of the body on the rear end side of the drum accommodating section and spring biased in the up... | 11/01/1977 |
