Constructional features of telephone sets

Full Title

Substation equipment, e.g. for use by subscribers > Constructional features of telephone sets

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

TELEPHONIC COMMUNICATION

Child Classifications

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• H04M 1/03 Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
• H04M 1/04 Supports for telephone transmitters or receivers
• H04M 1/11 Supports for sets, e.g. incorporating armrests
• H04M 1/15 Protecting or guiding telephone cords
• H04M 1/17 Hygienic or sanitary devices on telephone equipment
• H04M 1/18 Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
• H04M 1/19 Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
• H04M 1/2 Arrangements for preventing acoustic feedback
• H04M 1/21 Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
• H04M 1/22 Illumination; Arrangements for improving the visibility of characters on dials
• H04M 1/23 Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof