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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 4930153 | PBX voice mail interface An interface is described which attaches between the incoming trunk lines from a central office and a PBX system and which monitors the communication between the central office and the PBX to record the signals representative of telephone extension of a c... | 05/29/1990 |
| 4914690 | Universal PBX interface A universal PBX-to-central office interface for standards conversion is described for supporting normally incompatible telephone equipment in PBX environments. The present invention is adapted for connection between the central office and a PBX along DID ... | 04/03/1990 |
| 4843620 | Hand-held telephone line signaling test instrument A hand-held telephone line signaling test instrument is described which provides test and timing measurment for telephone lines employing DID, DOD and POTS trunk lines. The hand-held instrument is capable of sourcing wink-start reverse battery protocol an... | 06/27/1989 |
