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| Number | Title | Issue Date |
| 4054870 | Ringer assembly A telephone-type ringer assembly with an improved volume control operable from the exterior of the closed housing in which the ringer is contained. The volume control comprises an eccentric control wheel for one gong to settably vary the distance from the... | 10/18/1977 |
| 4040051 | Electromagnetically operated audible signal generator An audible signal generator comprises a coil, a pole piece, and an armature movably mounted with respect to the pole piece so that one end of the armature approaches the pole piece upon energization of the coil. The pole piece has a pair of spaced protrus... | 08/02/1977 |
