From the cover of the rule book:
"A practical set of World War II Wargaming rules for the HO and MICRO scale enthusiast."
From inside the rule book:
"After a decade of continuous use world wide and over 20 years of continuous research and development, ANGRIFF still remains the most widely used set of World War II wargame rules for HO and MICRO scale miniatures."
Text is from the revised and expanded edition published in 1982.