Hello, easy for many, can you tell me what these parts are?Click to view attachment Click to view attachment Click to view attachment

The first pic looks like a circuit breaker. I've not seen anything like that in my 73 or 74 engine bay, but it does look like the one for my A/C unit.

The second pic is the cover which protects the relay board. (assuming that's what you're asking about).

The third pic is the charcoal canister designed to reduce gas vapors inside the car.