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Staatsbedrijf der Posterijen, Telegrafie en Telefonie

Between 1928 and 1989, Staatsbedrijf der Posterijen, Telegrafie en Telefonie (PTT) was the Dutch state-owned telecom monopolist, responsible for mail, telegraph and telephone services. It was the successor to the P&T, and was part of the Ministry of Transport (Dutch: Ministerie van Verkeer en Waterstaat). In 1989 privatised and split into Postbank (bank), TPG (mail) and KPN (telecom).

In the period following WWII, the Dr. Neher Lab of the PTT developed a series of cipher machines at the request of the Dutch Government. The production of these machines was later taken over by Philips Usfa. Until 1989, the Radio Monitoring Service (RCD) of the PTT was responsible for enforcement of the telecom laws, in particular with respect to the use of the radio spectrum.

 More about PTT

PTT cipher machines on this website
PTT Colex (predecessor of Ecolex)
Philips Ecolex I
Philips Ecolex II
Further information
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Crypto Museum. Created: Tuesday 08 December 2020. Last changed: Saturday, 15 May 2021 - 21:25 CET.
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