Strowger step-by-step switch demonstration

This is a 2-digit strowger switch. It counts pulses from a rotary dial telephone (or system) and can accumulate two dialed digits. These were usually combined to allow for longer digit strings. A 7-digit string would require at least 4 of such switches (and a lot of other gear to send the ring signal, the dial tone, the busy tone, etc.) Anyone having knowledge of these (or this stuff in general) please do add your thoughts, especially if I got something wrong.