Modification work order MWO (series). Sig 11-850-3. Modification of radio receivers BC-312-A,-C,-D,-E,-F,-G, HX,-M,-N,-NX. BC-342-C.-D,-F,-H,-L,-M,-X, BC-314-C.-D,-E,-F,-O, and BC-344-D, to prevent leakage in AVC circuit, Changes 1; May 11, 1950.