tempered glass

Armored glass Until the 1970s, the only measure to prevent attacks on or sabotage of the telecommunications network was simply to lock the front doors after closing time. After the train hijackings and hostage-taking, but also with the emergence of terrorist groups such as the Bader Meinhof and RaRa, there was a growing awareness that […]

Types of telephone exchanges – bicycle parking de Neude

Types of telephone exchanges Over the years, the capacity of the telephone exchange has continued to grow. Fewer and fewer people were also needed for operation and maintenance. Photos above portray this development. In 1926, approximately 1 operator was needed to serve 100 customers. In 1960, 1 maintenance engineer was needed per 1000 customers to […]

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