Guard lock

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(Engin.) a tide lock at the mouth of a dock or basin.

See also: Guard

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Officers used a key to open the door but couldn't get in because the interior swing guard lock was engaged.
has approved a nearly $6 million contract to rehabilitate the century-old East Guard Lock at the intersection of the Erie Canal and Genesee River in Rochester.
Storing a home defense handgun in a bedside lock box with an easy unlocking device provides much faster access than trying to unlock a trigger guard lock in the dark.
Available options include: extra shelves, stainless steel drawers, sliding basket drawers, temperature chart recorder and chart paper, stainless steel interior and/or exterior, reverse hinge doors, 4-20 MA temperature output, Secure Guard lock system, internal electrical outlet, and access port 2" sleeve with cover.
The system is capable of programmable logic control functions, for safety light curtains, scanners, safety mats, and magnetic interlocks such as fieldbus input/output, fieldbus probe output, 4 different types of muting, muting override, guard lock functions, memory operators, counter operations, timer operator, logical operators,
Sentinel ships with the standard Wilson Combat package of accessories, including two eight-round magazines, a pistol rug, silicone cleaning cloth, manuals and a Trigger Guard Lock. The Ms.
Flip a small retention switch on the trigger guard lock and get ready for a lightning-fast draw.
The duty holster models include the Astro Double Retention Holster with a dual trigger guard lock feature.