The output from Oak Industries included printed circuit boards, discrete keyboard and calculator switches and full membrane keyboard assemblies. The Oak logo can be found on the PCBs of a number of keyboards, including those of most BBC Microcomputers; this is somewhat misleading as it can lead people to think that Oak made the entire keyboard. (Another PCB manufacturer whose PCBs are branded is Sung Wei, who made many PCBs for Datacomp.)
Oak are now Oak-Mitsui. However, the switch division is now owned by Electroswitch.