Murph Guitars was founded by Thomas Patrick ‘Pat’ Murphy. Murphy was born in 1920 in Illinois and was an air force mechanic in the US Navy during World War II. By 1960 he had moved to California and had a family of 5 musically talented kids - they had a family singing and dancing group called The Murphys. The oldest two boys played the guitar. It was their guitar teacher who convinced Pat Murphy to try his hand at making a line of electric guitars. Murphy Music Industries began in 1965 in San Fernando in 1200 square foot building at 1817 First Street. By 1966 Murphy had a range of solid body guitars and amplifiers and had 22 workers. At this point Murphy Music Industries received a ‘cease and desist’ letter from CBS -Fender  which claimed that the body shape of the Murph Squire guitar was too much like the Fender Jazzmaster & Jaguar.

Prince Tsushinkogyo Co. Ltd.  (Prince Telecommunication and Engineering) was founded in 1950  in Nagoya, Japan. They concentrated on making tuners and solid state musical instrument amplifiers which were sold under the Prince brand names as well as others (such as Memphis). The company began to use the Arion brand name in 1980 and began making guitar effects pedals. The company's fortunes declined in the 1990s and by 1997 Arion was sold to the Ueno Kaihatsu Center, who continued making pedals and tuners, but discontinued the amplifiers.
 

Marlboro Sound Works was a brand name of Musical Instrument Corporation of America (Syosset, New York) in the late 1970s and early 1980s. These budget solid state amplifiers were often distributed through mail order catalogs such as Montgomery Ward.

Source: Marlboro amplifiers catalogs (1979 to 1982)

The AHED company was established in the early 1970s when Phil Anderson amalgamated the various divisions of Arc Sound Company into one corporation called AHED Music Corporation Ltd. (Arc Home Entertainment Diversified). AHED sold musical instruments  pianos, organs and guitars, through Mr Music stores but were best known for their GBX, Taurus and Darius amplifiers. AHED ceased operations in 1986 due to the slow Canadian economy and changes in the music industry.

Source: History of ARC Sound Company (2 February 2018)

Loco Amplifiers and LocoBox Effects were Aria brand names. The pedals were handmade (from the late 1970s onwards) by a small team in Urawa, in Saitama, Japan who sold their pedals to Aria,  Although the main brand name was Locobox, they also produced identical pedals under different brand names including: Electra, Volz, Nadines, Cutec, Pearl, Gig, Powervoice, Studio Series and even a few Yamaha pedals.The company was then aquired by Aria who started producing Loco amplifiers as well.

Source: Loco and LocoBox catalogs 1981.

Source: Jaimie Muehlhausen's Unofficial LocoBox website (archived 2006)