(under subclass 88) Devices usually comprising an electromagnet and armature for producing distinct audible signals in conformity to the code employed and characterized by some acoustical properties.
SEE OR SEARCH CLASS
116, Signals and Indicators,
137+, for mechanical instruments or devices for simulating code signals.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,
2+, for electromagnetically actuated circuit controllers generally and subclasses 220+ for electromagnets with armatures. 361, Electricity: Electrical Systems and Devices,
