That is a Tappan microwave like John just picked up (with the Westinghouse name) this summer in NY. Beautiful!
I've had friends with the low-voltage lighting systems in their homes and it's a pain to keep them working properly - and a huge pain to rewire when they finally give out completely. A central control unit with wires running every which-a-way through the walls, ceilings, floor joists make for a tangled web of PITA. Super cool though - I always liked the way they worked and the central control switches could be fun for pranks!
You can just imagine getting a tour of the house when new - the can opener (piercing the cans of beer being served) the microwave oven that would wow most everyone in the crowd, warming drawers to keep the tiny bacon-wrapped wieners at serving temperature. What a dream house!!