YES ... UHF Amplifier, likely for FM service (Class C)
15 watt INPUT (Max) for 40 watt OUTPUT.
Jim Eagleson worked at KLM in that era (1970s)http://members.surfbest.net/eaglesnest/resume.htm
These amplifiers were designed by Ken Holladay, K6HCP (KLM, Mirage, RF Concepts and now JK Designs).
"KLM" stood for Ken, Leeland, and Mike.
The original company group of Ken Holladay - K6HCP, Leeland "Mel" Farrer - K6KBE,
and Mike Staal - W6MYC.
The amplifier line was eventual acquired by Mirage (late 1970s),
then MFJ acquired Mirage in 1990s.
KLM VHF (2-meter) Amplifier Manualshttp://radiopics.com/1.%20Manuals/KLM/KLM%20Amplifiers.pdf