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Frequency Clock (1924)
1961 Estimating Slide Rule
1952 Hard Hat
1949 Sight Meter
1960 Commissioning Candy Dish (Boundary Dam Power Station)
Light Bulb, Westinghouse (1893 - 1905)
Hot Stick, 1920s
1960s Illuminated Sign
Regina, 1957, Natural Gas Crew
Kenotometer (Early 20th century)