Thanks for sharing these with us Chris. Some interesting stuff there!
a CrouseHinds porcelain outlet. Not sure of the application of it
Ah.... A double T-slot receptacle again. Have a look back through the Nostalgia area; we've had several discussion about the use and development of these.
Also an unusual old brass toggle wall switch with plate
Similar switches were once common in some British applications -- Different mounting arrangement to suit our different boxes and plates, but the same style of toggle. They were fairly common for multi-way switch banks on 1940s/50s installations in schools, commercial buildings, etc.