Venner Time Switches Ltd - Type No.F.60 - No. 4247 - 1900-1949

Venner Time Switches Ltd No 4247 Type No F 60
mechanical pkt stopwatch
produced in Switzerland it was primarily utilized during the early to mid 20th century by engineers and technicians in the electricity supply industry explicitly designed for electricity meter testing and time switch calibration to accurately calculate load consumption and timing relays across utility networks