Protector lock
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The term protector lock has referred to two unrelated lock designs, one invented in the 1850s by Alfred Hobbs, the other in 1874 by Theodor Kromer.
A key from an early example of a Kromer protector lock; these keys were made in all shapes and sizes but the bit is similar in all cases
Alfred Charles Hobbs
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Alfred Charles Hobbs was an American locksmith and inventor. He was born in Boston, Massachusetts, in 1812; his father was a carpenter. He married Charlotte F. Nye of Sandwich, Massachusetts, in 1835
Protector lock
…The term protector lock has referred to two unrelated lock designs, one invented in the 1850s by Alfred Hobbs, the other in 1874 by Theodor Kromer. The Protector lock (also called the "moveable lock") was an early 1850s lock design by the leading American…
Alfred Charles Hobbs 1886
Sign on a strong room door.