Special Features:

Major components: plate, register 1; ring, code 1; mounting configuration: one center hole 0.500 inch diameter; one open slot 0.3125 inch long by 0.219 inch wide; both code bar and register plate made from beryllium copper per qq-c-533; heat treated to rockwell c-38 - c-42; wheel has 38 divisions spaced 5 degress 37 minutes 30 seconds apart and each division located within 0 degrees 2 minutes 0 seconds of true position

Properties:

Two or more different types of items having a common mounting or mounted on each other which together form a portion of a teletypewriter but which in itself is not a complete functioning item and cannot be assigned a more definite item name.