NEW CAR LOCK THWARTS THIEF (Sep, 1934)
At least until the invention of the Bic Pen.
NEW CAR LOCK THWARTS THIEF
Using a cylindrical key, a recently marketed auto-bile lock for doors or ignition is said to afford protection against thieves. A thief attempting to open the lock would have to pick each of its seven plungers separately. Drilling or shearing off the lock is said to be impossible because of the hardened steel shell. The lock does not bear a number, a secret number being furnished the owner. Duplicate keys can be obtained from the factory only on presentation of the complete lock, which prevents thieves from securing a duplicate key for unlawful use.