Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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DE MARZI UBALDE
Original Assignee
DE MARZI UBALDE
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Application filed by DE MARZI UBALDEfiledCriticalDE MARZI UBALDE
Priority to FR7129515ApriorityCriticalpatent/FR2148997A5/fr
Application grantedgrantedCritical
Publication of FR2148997A5publicationCriticalpatent/FR2148997A5/fr
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets