Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04M
TELEPHONIC COMMUNICATION
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Substation equipment, e.g. for use by subscribers
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H04M1/02
Constructional features of telephone sets
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H04M1/18
Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
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H04M1/185
Improving the shock resistance of the housing, e.g. by increasing the rigidity
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