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Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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| Number | Title | Issue Date |
| 4304992 | Magnetic card reader A sensor observes a timing track along a magnetic stripe on a magnetic card and detects change in the sliding speed of the magnetic card relative to the magnetic head as a timing signal, by which reading or writing of a data signal by the magnetic head is... | 12/08/1981 |
| 4297735 | Manually operable magnetic card reader and magnetic head assembly therefor A manually operable magnetic card reader including a housing 10 and a magnetic head assembly 40. The housing is provided with an elongate slot 23 adapted to receive a card C having a stripe MS of magnetized material extending along a major surface of the ... | 10/27/1981 |
| 4151564 | Modular, semiautomatic credit card reader/writer apparatus A reader/writer credit card modular assembly wherein a T-shaped vertically disposed rail member provides accurate positioning of a credit card relative to a read/write transducer and to a timing track transducer through a reference plane established by me... | 04/24/1979 |
| 4028734 | Plural magnetic head assembly with independently supporting structure A magnetic stripe head assembly comprised of a support having a plurality of transducer heads mounted on leaf springs attached at one end to the support and at the opposite end to the transducer heads. The leaf springs permit individual translation of eac... | 06/07/1977 |
| 4005491 | Dampened transducer support apparatus for message announcing system An announcing system including a message drum with a plurality of listening-recording heads radially spaced around the message drum, each of the listening-recording heads being adapted to traverse a portion of the surface of the message drum, and each of ... | 01/25/1977 |
