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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H04M1/60
including speech amplifiers
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H04M1/6033
for providing handsfree use or a loudspeaker mode in telephone sets
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H04M1/6041
Portable telephones adapted for handsfree use
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H04M1/6058
involving the use of a headset accessory device connected to the portable telephone
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H04M1/6066
including a wireless connection
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