Two Rock K & M Analog Designs, LLC was founded in 1999 by Bill Krinard and Joe Mloganoski. In November, 2010 Two-Rock was acquired by Premier Builders Guild,
Dating Two Rock amplifiers

“We started in 1999. Date of production is hand written inside amp, along with builder’s signature.” [Source:  Joe Mloganoski, K&M Analog Designs, email 19/3/2008]

Two Rock Amplifiers article

Images eBay: Kimock is a limited edition Two Rock amp

Two Rock Amplificatio head Two Rock Kinock amplifer head