The Segal Lock and Hardware Company of Manhattan, New York was a leading manufacturer of hardware merchandise and razor blades in the 1920s and 1930s. First established in Connecticut and Manhattan, the firm relocated to Brooklyn, New York in the mid 1920s. The Segal Safety Razor Corporation was a subsidiary of the Segal Lock and Hardware Company. The business was at first known as the Burglar-Proof Lock Company. Segal was started by Samuel Segal, formerly a New York City detective in 1912, through his invention of a nearly burglar-proof lock. The vertical deadbolt lock eliminated a horizontal bolt, concentrating on the hinge principle. Segal had noticed that burglars picked locks but never hinges. The firm's beginning was aided by a few more policeman.