USD457867SExpiredUtility
Telephone headset amplifier
Est. expirySep 5, 2020(expired)· nominal 20-yr term from priority
Inventors:Klaus Rath
48
PatentIndex Score
5
Cited by
14
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for a telephone headset amplifier, shown and described.
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