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| Number | Title | Issue Date |
| 6958711 | Keyboard A keyboard includes a plurality of key elements arranged in rows and columns in a matrix-like manner. Each key element has first and second break contacts which are decoupled for safety reasons and are commonly activated when the key element is actuated. An energy s... | 10/25/2005 |
| 4742348 | Triangular matrix device for the assignment of priorities Device for assigning priorities having a plurality of request channels addressed by request signals, including a plurality of output channels arranged with the request channels in matrix form, each of the request channels being directly connected to one o... | 05/03/1988 |
| 3940918 | Programmer clocks for banks and like institutions A programmer clock for use with alarm systems in banking and like institutions employs a diode matrix, day and hour stepper switches and a direct current motor driven clock, the positions and controls of all of which are mounted and visible on a single co... | 03/02/1976 |
