Korg Inc. is a Japanese multinational company that makes electronic musical instruments, audio processors and guitar pedals, recording equipment, and electronic tuners. Korg was founded in 1963 in Tokyo by Tsutomu Kato and Tadashi Osanai as Keio Gijutsu Kenkyujo Ltd.(it later became Keio Electronic Laboratories) and their first product, released in 1963, was an electronic drum machine - the Donca Matic DA-20. In 1967 the company developed an organ - sold as the KORG and this became the companies overall brand name. In 1973 they designed their first synth the Korg miniKORG and by the 1980s Korg were making electric pianos. In 1992 they acquired Vox - best known for its guitar amplifiers and under this brand they make guitar amplifiers and electric guitars.

Source: Korg website (8 November 2019)

DOD Electronics was founded in 1973 by engineer David Oreste Di Francesco and musician John Johnson. The company was later taken over by Harman International.

Source: DOD website (16 November 2018)
 

The Biyang brand was launched in 2003 as an affordable guitar effects range made in Shanxi province, China. In 2007 Biyang launched the Tone Fancier range - with mirror surfaced matching stainless steel control panels. The Biyang Baby Boom pedals were released in 2010 - these were miniature colorful pedals. In 2012 Biyang released the Classical Series, with pedals based on iconic designs of the past (e.g. the Biyang DS-12 is modelled on the 1980s RAT distortion pedal).  2015 saw the launch of the Biyang Live Master series -  a modular pedal board multifx system.

Source: Biyang website

Dynacord was a German brand specialized on high end music electronics, with a shortlived program of guitars and basses introduced in 1965.