HANDCUFF SECRETS - HOUDINI Germany where they do not use padlocks, and the key marked x seems to be a kind of a master key to the spurious Bramah safe locks. Illustration No. 10. … Illustration No. 11 shows a set of master keys useful on the English rimlock. Previous to the year 1778, when Baron invented the now well-known tumbler lock, the majority of locks used in England were of such a nature that at the present date they would be called "jokes."…