81. Wallis (Barnes Neville) Improvements in Explosive Missiles and means for their discharge, Complete Patent Specification 937,959, 3 folding lithographed plates, 1963; bound with Improvements in means for Supporting and Releasing Explosive Missiles carried on Aircraft, Complete Patent Specification 937,960, 1 folding plate, 1963, disbound, small folio.
est. £200 – £300
This is the actual Dam-buster bomb patent. Patents useful to enemy states don't get published, the delay between the filing and acceptance apparently for security reasons.