- A Mercedes-Benz diesel engine with a Bosch fuel injection pump and governor system.
- A memorial to Increase A. Lapham.
- A Member Connection Publication History Project.
- A Member Connection History Project.
- A mechanical clock on a piston
- A MECCA jet engine.
- A MECCA jet engine.
- A MECCA Company gas turbine engine.
- A mean looking JD318.
- A McCormick turbine with a Woodward compensating type C water wheel governor
- A McCormick turbine with a Woodward compensating type C water wheel governor
- A master recipe index.
- A massive Woodward metering valve for the LM5000 gas turbine engine.
- A massive Soo Line Railroad steam locomotive engine on display.
- A massive Soo Line Railroad steam locomotive engine on display in Portage County, Wisconsin.