Self-contained alarm lock with tamper-proof interlocked casing formed from extrusion

摘要: An integral self-contained, key-operated alarm lock, the major portion of casing for which can be made from two longitudinally slidably tongued-groove interlocking channel extrusions, has an electronic circuit composed a finger on-off switch, striker proximity bolt position switch and latching holds on when it been activated, until properly shut off.