MIL-T-55221 1963 Edition, March 8, 1963
THERMOMETER, SELF - INDICATING, BIMETALLIC, M2
Includes all amendments and changes through Notice 1, February 18, 1986
Additional Comments: CNCL NO S/S
This specification covers one type of bimetallic self-indicating thermometer used for checking the propellant powder temperature of 762MM Rockets and 318MM Rockets.