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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6850138 | Vibration actuator having an elastic member between a suspension plate and a magnetic circuit device A vibration actuator in which a magnetic circuit device (1,2,3) is elastically suspended to a vibration transmitter (12) by a suspension plate (5)in a predetermined direction, a primary elastic member (6a) is interposed between the... | 02/01/2005 |
| 6492899 | Electromagnetic converter having superior anti-shock property An electromagnetic converter in which a mobile magnetic pole body supported by a thin spring is driven by an exciting coil. A restricting member limits movement of the spring so the spring is not deformed beyond a stress limit when the spring receives an ... | 12/10/2002 |
| 4075626 | Alarm buzzer An alarm buzzer comprising an electromagnet, a yoke on which said electromagnet is mounted while maintaining insulation from the housing, an armature which is held with a plate spring on said yoke and is attracted by said electromagnet, a vibratory plate ... | 02/21/1978 |
