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Resolution: Apartment corridor door lock - Latch bolt operated by knob/lever from either side, except when outside knob/lever is made inoperative by buttons in face. Dead bolt operated by key outside or turn i...:

MA541

Resolution: Room door lock - Latch bolt operated by knob/lever from either side. Dead bolt operated by key from outside or turn from inside.:

MA551

Resolution: The MA551 Holdback was not UL listed. :

MA561

Resolution: Classroom lock - Latch bolt operated by knob/lever from either side except when outside knob/lever is locked from outside by key. When outside knob/lever is locked, latch bolt is retracted by key f...:

MA571

Resolution: Dormitory or exit lock - Latch bolt operated by knob/lever from either side. Dead bolt projected by key from outside and turn from inside. Operating inside knob/lever retracts both bolts and unlock...:

MA581

Resolution: Storeroom lock - Latch bolt operated by key from outside or by operating inside knob/lever. Outside knob/lever is always inoperative. Auxiliary dead latch.:

MA621

Resolution: Front door apartment corridor - Latch bolt is operated by knob/lever from either side, except when outside knob/lever is made inoperative by buttons in face. Dead bolt is operated by turn inside. K...:

MA641

Resolution: Dormitory lock - Latch bolt by knob/lever inside and key outside. Inside knob/lever free. Outside knob/lever rigid. Deadbolt by key outside or T-turn inside. Rotating inside knob/lever retracts bot...:

MA851

Resolution: Storeroom-fail safe (EL - 12 & 24 VDC) - Latch bolt operated by knob/lever from either side except when outer knob/lever is electrically locked. When outer knob/lever is locked, latch bolt retracte...:

MA881

Resolution: Storeroom-fail secure (EU - 12 & 24 VDC) - Latch bolt operated by knob/lever from inside except when outer knob/ lever is electrically unlocked, then latch bolt from either side. When locked, key i...: