needle bar thread guard
needle bar thread guard screw
rolled and griped straight thread steel bar
the thread rolling bar connection
sharp V-thread (full V-thread)
V-thread (triangular thread)
bar code, bar code reader
bar machine ice bar freezer
bar-to-bar voltage peak
five-bar linkages similar to four-bar linkages
“Burried thread” method
16screw three thread slitting
absorbent gauze with X-ray detectable thread