Here's a photo of a manhole cover
The letters form the word "ТЕЛЕФОН" ("telephone" in Russian in ALL CAPS).
What is on the picture in the center? Perhaps it is some part that should be associated with communications but I have no slightest idea what it might be.
I've Googled a lot and found that this image is a logo of a USSR state organization responsible for communications which acquired all the assets (logo included) of Svensk-Dansk-Ryska Telefon AB (rus Шведско-Датско-Русское телефонное акционерное общество) telecommunications company that used the same logo.
More Googling finds this one century old logo of a Stockholm telecommunications company that has the same image yet much simpler and with carefully depicted main details.
So far I've seen various explanations of the image, including a receptacle and a candlestick telephone earphone (the earliest telephone design had a fixed microphone and the earphone had to be held next to ear). However none of the claims are backed with reputable sources.
What is the electric part on the image in the center of the cover?