Lotus brand guitars were made from the late 1970s until the late 1990s. Some were made in Korea by Cort and Samick, others in Japan by Morris, some were also made in India. Lotus guitars were typically copies of Fender or Gibson designs.

Source: Wikipedia Lotus Guitars (17 Janaury 2018)

Leo Master was an American guitar, banjo and ukulele brand of the 1930s era most likely made made by the big Chicago makers like Regal, Kay etc.

Sam Koontz began making guitars in 1959, and through the sixties became known for his idiosyncratic guitar designs. He made guitars with built-in effects and one of his guitars had a built in battery powered amp, speaker and tape recorder. He also made more conventional instruments: working for worked for Philadelphia Music Company (the US importer of Framus) and also designed guitars for Harptone and Standel. He started his own business in the 1970s making guitars (mainly archtops) in his Linden, New Jersey workshop. His business was not successful and following the death of his wife, Koontz took his own life in 1981.

Chris Knutsen was born in Norway in 1862 as Johan Christian Kammen. His family emigrated to Minnesota when he was 3. He moved to Port Townsend in Washington State in 1895, where he began patenting unusual harp guitar designs. Knutsen started building Hawaiian steel guitars as early as 1908 - and was the first builder in mainland USA to do so. Most of the guitars made by Knutsen have spruce tops with lateral or diagonal bracing on the back. Many show signs of his eccentric building skills - like necks fixed with metal brackets and seams joined with dressmaker's tape. In 1914 he moved to Los Angeles, just as the Panama-California International Exposition ignited the Hawaiian music craze in the mainland United States. Accordingly, Knutsen began to produce harp ukuleles and Hawaiian guitars to meet the new demand. He died in Los Angeles in 1930.

Source: Harp Guitars - Chris Knutsen

The first Kingston guitars were Harmony Stella style acoustic models made by Terada in Japan from the late 1950s to early 1960s for distribution in the USA by Jack Westheimer. By the mid 1960s Westheimer was also importing Japanese Kingston electric guitars made by Kawai, By the mid-1970s it was more cost-effective to produce the guitars in Korea so Westheimer opened a factory there, which became Cort. These Korean Kingston guitars carried on until the early 1980s. The Kingston brand reappeared in the late 1980s and early 1990s on cheap Asian made electrics. There was also a line of Indonesian Kingson acoustic guitars from 1994 onwards.

Kala Brand Music Company was established in 2005 in Petaluma. California as a ukulele company. In 2007 they introduced the short scale U-Bass and now also offer acoustic guitar models.

Source: Kala Brand Music Company website

Lame Horse Instruments was started in a garage in Texas in 1995.  Lame Horse guitars and banjos are made by the father and son team of Chris and Jeremy Jenkins in their respective workshops in Mansfield and Austin, Texas.

Source: Jenkins and Son, Luthiers website

Savannah is a budget folk instrument brand distributed in the USA by Music Link.

Source: Savannah website