GB776588A - - Google Patents

Info

Publication number
GB776588A
GB776588A GB776588DA GB776588A GB 776588 A GB776588 A GB 776588A GB 776588D A GB776588D A GB 776588DA GB 776588 A GB776588 A GB 776588A
Authority
GB
United Kingdom
Prior art keywords
relay
operated
amplifier
loud
speaker
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.)
Active
Application number
Other languages
English (en)
Publication of GB776588A publication Critical patent/GB776588A/en
Active legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB776588D Active GB776588A (cs)

Publications (1)

Publication Number Publication Date
GB776588A true GB776588A (cs)

Family

ID=1751920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB776588D Active GB776588A (cs)

Country Status (1)

Country Link
GB (1) GB776588A (cs)

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