H04M 11/02
Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
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Edits on 16 Mar, 2022
Golden AI
Golden AI
Golden AI
Edits on 5 Mar, 2022
Golden AI
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Description (+129 characters)
H04M 11/02
Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
Infobox
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