Nice find!
Bloksma Radiateurenfabriek (radiator factory) was a medium sized company founded by Mr Bloksma in 1920. In the 1970s they had 15 branches, which were later sold to the branch managers or amalgamated into Bloksma's Nederlandse Radiateuren Fabriek (Netherlands Radiator Factory, NRF) (
https://www.nrf.eu/about-nrf/our-history/)
