Communication equipment of the firing control station

Everything is like on a ship - intercom tubes and switches in the manner of a machine telegraph, which indicate the order of loading the gun and firing routine.
In 1941, these guns waged counter-battery combat against Finnish artillery, firing at the islands surrounding Hanko, as well as at the city of Tammisaare, which is why the Finns had to evacuate the town. In total, 570 shells were reportedly expended.