night latch lock : outside by keys and inside always by handle

In 1838 ,first known use of NIGHT LATCH. A door lock haveing a spring bolt operated from the outside by a key and from inside by a knob.

Available as deadlocking (automatically locks once shut and non-de adlocking version.
OUTSIDE : Operated by key outside.Locks automatically when door is closed.

INSIDE: Opened by handle at all time .

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