2 Security Doors Made Of Iron, Marked “brevetti S.i.s.t.i. – Milan,” Dating From The 20th Century

PTCI571 - An important pair of reinforced iron doors, equipped with an original central locking system bearing the “Brevetti S.I.S.T.I. – Milano” mark, a testament to specialized Italian manufacturing.
The door panels feature a horizontal sheet metal structure, reinforced by sturdy diagonal cross-braces that converge at the central multi-handwheel mechanism. The patented system activates a lock with vertical tie rods and upper and lower anchor points, ensuring a secure, airtight seal typical of technical or secure environments.
The cast mark on the lock body identifies the Milan-based manufacturer S.I.S.T.I., a company active in the technical and industrial locking sector during the first half of the 20th century.
One of the doors is equipped with protected upper ventilation slits, a functional feature typical of technical rooms, bunkers, vaults, or industrial environments with controlled air flow.
Dated 20th century.
Dimensions: L 81 x H 182 cm