Description:
Grover & Co. technical drawings: Technical drawing of a Five Step Cam H.M.S.O. L.H. Pattern number 518 & A; R.H. Pattern number 519 & A. [pencil annotation: 'see 4 Path 1" to 2" drawing number 4997'.] Drawing number 5678. Scale full size. Date 31 October 1948. 47.5cm x 40.5cm.