The devices are self contained. They don't have a special box, they are mounted in their own integrated enclosure.That doesn't show the interior of the bakelite enclosure. Also these switches look like they have a special box for mounting. I also doubt that the neutral will be allowed to connect to the yoke. I suppose that would be the ground and neutrals just spliced in the box. Defeats the purpose of these
This is true, but in the picture of these three switches, all the hots connect together, so just one circuit, so not a MWBC!MWBCs were quite common in the knob-and-tube days. This was done with some early NM cable, but likely within the time frame where K&T was still prominent.
This is the strangest switch I have ever seen. It appears the neutrals are connected thru the yoke and the hot wire passes thru to the bar at the bottom right and presumably is switched to the switch leg on the bottom left.
Anyone seen this before.
Because this model was sold as 1p (one pole) or SPST, so ON and OFF are on the handle.I thought that too, but then why the on / off indication
They are a complete assembly, there is no "yoke" as you have mentioned before, the switch is not replaceable if it goes bad you need to replace the entire assembly. They are intended for surface mounting, Your OP was not a multi gang flush assembly it was multiple individual units mounted next to one another and someone tried to make them semi flush. There is no trim plate to cover edges of the finished wall if you tried to recess them like there is for regular switches in a box.
By "feed through" I mean you can run power in say the top with one cable and out the bottom with another cable. A third cable likely means needing to double up conductors on at least some terminals - that is not acceptable with that type of terminal though it was done a lot.In the absence of individual copper washers between each conductor there is a word for how the white wires are terminated. Let me think. Oh I remember now. That word is BOGUS!