FR660753A - Improvements to micro-telephones - Google Patents

Improvements to micro-telephones

Info

Publication number: FR660753A
Authority: FR; France
Prior art keywords: telephones; micro
Prior art date: 1927-09-20
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.): Expired

Application number

Other languages

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Telefonaktiebolaget LM Ericsson AB

Original Assignee

Telefonaktiebolaget LM Ericsson AB

Priority date (The priority date 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 date listed.)

1927-09-20

Filing date

1928-09-14

Publication date

1929-07-17

1928-09-14 Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB

1929-07-17 Application granted granted Critical

1929-07-17 Publication of FR660753A publication Critical patent/FR660753A/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Telephone Set Structure (AREA)

FR660753D 1927-09-20 1928-09-14 Improvements to micro-telephones Expired FR660753A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
SE297390X		1927-09-20

Publications (1)

Publication Number	Publication Date
FR660753A true FR660753A (en)	1929-07-17

Family

ID=20307356

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR660753D Expired FR660753A (en)	1927-09-20	1928-09-14	Improvements to micro-telephones

Country Status (4)

Country	Link
BE (1)	BE354302A (en)
FR (1)	FR660753A (en)
GB (1)	GB297390A (en)
NL (1)	NL25060C (en)

0
- NL NL25060D patent/NL25060C/xx active
- BE BE354302D patent/BE354302A/xx unknown
1928
- 1928-09-14 FR FR660753D patent/FR660753A/en not_active Expired
- 1928-09-18 GB GB26757/28A patent/GB297390A/en not_active Expired

Also Published As

Publication number	Publication date
BE354302A (en)
GB297390A (en)	1929-11-28
NL25060C (en)

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