Radio part ?

[Vertol]

Hello,

 

I know it's like tossing a bottle into the sea, but I give a try ...

I have this part, found with Signal Corps equipment, that I cannot identify with my little knowledge.

I could open it to at least identify it's function, but I'd have to damage the rusty screws.

 

I could also be a part of an aircraft, or whatever requiring electrical supply...

 

Thank you in advance.

 

Best regards,

 

Vertol