Swiss Entrance at front of hive

A few people have asked me at this link about the metal structure at the front of my Italian hive.

From scanning through my Dad’s books, it is a ‘Swiss entrance’ used to control ventilation. I would also imagine that it is used for prevention of access to the hive by lizards, field mice and other small creatures. They are available on Italian bee keeping sites.

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What I was wondering about was those ‘latches’ on the two side walls of the porch at the very front?

Looks like a mouseguard to me. How much difference in ventilation would there be moving the plates apart? Absolutely none if you have a mesh floor and little with a solid floor. Definitely a mouse guard
Mind you it’s 1956 so would be a solid floor