In July 1918 the factory started with Marconi licences. It was a difficult start. An industry like this was completely new to Holland. There was no experience, the correct machines and tools had to be made and the workers had to be educated. On October 12th, 1918 however, NSF celebrated the completion of the first manufactured part: a transmitting coupler for the Dutch Navy.

The first NSF transmitter, that started on the 21st of July, 1923 was a public broadcasting transmitter on 1075 meters (279Khz). The necessary licence was issued for a transmission power of 20Kw.

N.S.F. broadcast transmitter building increased by the end of the 1920s. In this area the cooperation between N.S.F. and Philips proved to be very lucrative. Here the experienced transmitter builder and the big valve producer met. After the 500 Watt experimental transmitter was completed in 1923, NSF constructed a newer version for 5 kW. In 1927 the building of the 1875 meter transmitter in Huizen started, commissioned by the Nederlandsche Draadlooze Omroep. (Dutch Wireless Broadcasting)

In 1925 part of the Philips production line was moved to N.S.F. in Hilversum, first battery rectifiers, later - in 1927 - the first Philips receivers. N.S.F. kept on producing their own series of receivers every year, the NSF4 and the NSF5, together with the ultra-short tropical receiver I4A in the years 1927-1928 were very successful. In the end NSF receiver building blended in with Philips'. The brand itself remained in use for some time.

(Text based on the website: http://www.xs4all.nl/~levend/tvmuseum/)

 Examples of N.S.F. advertisements published in the 1920s.