The lock chamber is employed for the passage of packets or large-sized objects between a room reserved for the public and a premises which is isolated and protected from the public by a safety partition wall. It may be for example employed in administrative services such as post-offices, departmental stores or left-luggage offices of stations or airports, etc. In this lock chamber, the drum has at least one window closed by a transparent bullet-proof material. This window is diametrally opposed to the access opening for supervising the exchange. The drum has end-of-travel abutments and locking means which automatically fix the drum in any one of its loading or unloading positions.
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