On 1 October 1927, Stanisław Krzemień, Zofia and Armand Paszka founded the Warsztaty Precyzyjne-Mechaniczne i Optyczne (Precision-Mechanical and Optical Workshops) in Bydgoszcz.

[1] While the Paszka were responsible for formal matters related to contracts with clients and office management, Stanisław Krzymień was the master of precision mechanics: he gained professional experience in German enterprises such as Carl Zeiss AG, Optische Anstalt C. P. Goerz [de], Otto Tropfer and Askania Werke [de].

At that time, unlike other telecommunication firms in the country, the share capital of Warsztaty Precyzyjno-Mechaniczne i Optyczne was entirely under Polish control.

The incoming materials (celluloid, gum, ebonite, porcelain insulators) were initially imported from Germany and were later acquired directly from Polish factories.

[1] While the initial yield was focused on spare parts for telecommunications devices, the production of complete telephone switchboards (with a capacity up to 100 numbers) and telegraph Morse code systems began in 1935.

[4] In 1936, the company received two gold medals for High quality and Aesthetics of sockets and toggle switches at the Wystawa Przemysłu Metalowego I Elektrotechnicznego (Metal and Electrical Engineering Exhibition) in Warsaw.

[3] In the late 1960s, a cooperation with the Institute of Chemistry of the University in Toruń allowed the development of a patented technology about anti-corrosion coatings for telecommunications connectors.

[8] In parallel, social structures were developed for the benefit of the employees: a clinic, a sport club and a recreation center in Przyjezierze.

In the 1970s, Telkom-Telfa was one of the fastest growing industrial plants in Bydgoszcz,[2] as a result of the specific exports to Soviet Union which increased regularly every year.

[9] This tendency called for the expansion of the factory, which began in 1973 and was completed on 31 March 1976, with the opening of new facilities in the Brdyujście district, near the ROMET Bicycle Plant.

The demands of the strikers included a better supply of meat products, the raise of family benefits to the level of those received by the army and militia, free trade unions and the end of censorship.

[12] In that period, Telfa manufacturing extends to dispatch and loudspeaker devices, security alarms, components for telecommunication and control engineering.

In this dire situation, the firm was selected for immediate privatization, along with four others:[13] With this move, Bydgoszcz had become the seat of the second largest AT&T centre in Europe, after the Netherlands.

[13] On 16 November 1992, the American corporation AT&T, one of the world's leaders in telecommunications, purchased 80% of the shares of Telfa in Bydgoszcz, creating a bridgehead for its expansion in Central and Eastern Europe.

[17] In December 2023, Nokia Bydgoszcz opened its new headquarters in a modern office and residential complex erected between Ogińskiego and Chopina streets.