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Ericsson 1951
Analogue desktop telephone set - this page is a stub

Ericsson Model 1951 was a standard analogue telephone set for desktop use with pulse dialling, in a black bakelite enclosure, developed in 1951 and manufactured by the Ericsson factory in Rijen (Netherlands) for the Dutch state-owned telecom monopolist PTT 1 . The set was intended for use on the Dutch public switched telephone network (PSTN) 2 , also known as POTS. 3

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Ericsson telephone set model 1951

This page currently acts as a placeholder for future information about this telephone set. If you have any information that can help us to expand this page, please do not hesitate to contact us.

  1. PTT = Staatsbedrijf der Posterijen, Telegrafie en Telefonie (state-owned company for post, telegraph and telephone), privatised in 1989 and currently known as KPN.  Wikipedia
  2. PSTN = Public Switched Telephone Network.  Wikipedia
  3. POTS = Plain Old Telephone Service, or Plain Old Telephone System.  Wikipedia

Left view Ericsson telephone set model 1951 Front view With the handset off-hook Dial Ground-button
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Left view
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Ericsson telephone set model 1951
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Front view
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With the handset off-hook
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Dial
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Ground-button

Ericsson 1951 on this webite
The Ericsson Model 1951 is featured on the following page(s) of this website.

Wireless Easy Chair   WEC
In 1960, the Dutch Radar Laboratory (NRP) in Noordwijk developed a covert listening device (bug) for the Central Intelligence Agency (CIA), that used an existing analogue telephone set for eavesdropping on a conversation in a room.

This was done by connecting the WEC device shown in the image on the right at a so-called tapping point and injecting a strong RF signal. It was tested on a Heemaf 1955 and an Ericsson 1951, and works even when the set is on-hook.

 More information
  
WEC Mk I

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Crypto Museum. Created: Thursday 30 March 2017. Last changed: Tuesday, 13 June 2017 - 06:32 CET.
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