Minakuchi Engineering was a Japanese game developer, based in the town of the same name. They mostly handled porting and spin-off titles for other companies, and in particular worked as regular sub-contractors for Capcom for much of the early-mid 1990s. The company appears to have ceased to exist around 2003 or 2004.
Hiroshi Wada created the sound engine used in the company's early Game Boy titles. Kouji Murata designed a new sound driver for Bionic Commando (GB), which was used for their remaining Game Boy games.
Most of their SNES titles were sub-contracted from Capcom, so they just used Capcom's own sound drivers. The one known exception to this is F-1 Grand Prix (SNES), on which they used Yoshikazu Yao's sound driver.