"I was wondering if anyone has run into 70 type coil spring terminal blocks."

I saw them in only one building during 20 years of service in NYC. They are used as house terminals, in the East and West fire stairs, of a high rise "pre-war" apartment house, #808 West End Avenue aka "The Allendale." click https://streeteasy.com/building/808-west-end-avenue-manhattan

What a memory! If you would like, I can arrange a walking tour of my old district, and include this building on the itinerary.

Arthur P. Bloom
"30 years of faithful service...15 years on hold"