GB9003361D0 - Communication apparatus - Google Patents

Communication apparatus

Info

Publication number
GB9003361D0
GB9003361D0 GB909003361A GB9003361A GB9003361D0 GB 9003361 D0 GB9003361 D0 GB 9003361D0 GB 909003361 A GB909003361 A GB 909003361A GB 9003361 A GB9003361 A GB 9003361A GB 9003361 D0 GB9003361 D0 GB 9003361D0
Authority
GB
United Kingdom
Prior art keywords
communication apparatus
communication
Prior art date
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.)
Withdrawn
Application number
GB909003361A
Other versions
GB2228649A (en
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.)
COMPACT PRODUCTS Ltd
Original Assignee
COMPACT PRODUCTS Ltd
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.)
Filing date
Publication date
Application filed by COMPACT PRODUCTS Ltd filed Critical COMPACT PRODUCTS Ltd
Publication of GB9003361D0 publication Critical patent/GB9003361D0/en
Publication of GB2228649A publication Critical patent/GB2228649A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/16—Automatic or semi-automatic exchanges with lock-out or secrecy provision in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
GB9003361A 1989-02-14 1990-02-14 Telephone apparatus Withdrawn GB2228649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898903268A GB8903268D0 (en) 1989-02-14 1989-02-14 Communication apparatus

Publications (2)

Publication Number Publication Date
GB9003361D0 true GB9003361D0 (en) 1990-04-11
GB2228649A GB2228649A (en) 1990-08-29

Family

ID=10651642

Family Applications (2)

Application Number Title Priority Date Filing Date
GB898903268A Pending GB8903268D0 (en) 1989-02-14 1989-02-14 Communication apparatus
GB9003361A Withdrawn GB2228649A (en) 1989-02-14 1990-02-14 Telephone apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB898903268A Pending GB8903268D0 (en) 1989-02-14 1989-02-14 Communication apparatus

Country Status (1)

Country Link
GB (2) GB8903268D0 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9103786D0 (en) * 1991-02-22 1991-04-10 Energy Saving Services Energy saving unit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7809628A (en) * 1978-09-21 1980-03-25 Nederlanden Staat SWITCH FOR MULTIPLE CONNECTED PHONES.
US4332983A (en) * 1980-10-27 1982-06-01 Hosein Vakili Telephone privacy controller
US4443665A (en) * 1982-09-30 1984-04-17 Alderman Robert J Privacy and hold circuit for telephone
US4726048A (en) * 1984-04-03 1988-02-16 Waldman Herbert H Telephone privacy circuit
ES282513Y (en) * 1984-11-12 1986-10-01 Amper, S.A. EXCLUSIVE DEVICE FOR PARALLEL-INSTALLED PHONES
US4703499A (en) * 1986-02-21 1987-10-27 Arturo Fossas Distributed privacy oriented telephone extension system
US4747128A (en) * 1986-05-22 1988-05-24 Chan Kwok Leung Telephone privacy protector

Also Published As

Publication number Publication date
GB2228649A (en) 1990-08-29
GB8903268D0 (en) 1989-04-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)