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jackscrew
n. a threaded rod used for centering and balancing a vault door &
frame in position during installation
jamb
n. the vertical
components of a door frame
jiggered finish
n. a surface adorned with overlapping
concentric circles
jimmy
proof
adj. pertaining to
a lock having a bolt which interlocks with its strike
JIS
abb. Japanese
Industrial Standard
jumbo
cylinder
n. a rim or mortise
cylinder of 1-1/2" diameter
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