:^) They are a lot cleaner today.
When I worked for network news in NYC in the 70's a NY Tel tech told me that there was a telephone frame in the basement of an upper east side high rise apartment building with a seal attached to one pair that said something like Do not touch. Sealed by order of the President of the united States ... The phone was in an apartment where Henry Kissinger housed a squeeze.
Of course. Nothing new under the sun except high speed data processors and memory chips the size of a pin which can hold the entire history of the world.