I have a reprint of the 1920  International Harvester Gas and Kerosene throttle governor Mixer Instruction and Parts Manual.  It has 6 pages. Front and back are card stock. front stapled. It is 8 1/2" by 11". It covers basically everything you need to know about working the 3 needle valve mixer on all IHC M engines. This manual covers the 1 1/2HP to the 10HP M. It talks about basic parts of the mixer and how to operate it on the engine. A rare manual to have for the M. A great addition to any collection.