Annual Report of the Police Commissioner for the City of Boston
Signal Boxes. The total number of boxes in use is 566. Of these 489 are connected with the underground system and 77 with the overhead. ... Repairs have been made on 85 box movements; 22 registers; 68 locks; 18 time stamps; 28 vibrator bells; 70 relays; ... feet of overhead cable 34, 500 feet of duct 78 manholes 22 motor generator sets 18 motor-driven flashers 4 Chevrolet trucks 1 Ford truck 1 1949.
| Title | : | Annual Report of the Police Commissioner for the City of Boston |
| Author | : | Boston (Mass.). Office of the Police Commissioner |
| Publisher | : | - 1948 |
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