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Air meter

1960-1970

Airflow meter

1900-1930

Air Meter

1825-1875

Air meter on pitot tube principle

1950-1960

Air meter with 8 vanes, by Richard Freres, 1920-1930

1920-1930

Air meter no. 1458

1930-1939

Dines patent air meter

1900-1910

Unit for SO2 and smoke monitoring network, 1970s.

Unit for SO2 and smoke monitoring network, 1970s.

1970-1979

Anemotherm air meter by Dynamics Corporation of America, Anemostat Products Division, Scranton, PA, covered by US patents 2,377,884; 2,389,615; 2,612.047; 2,648,224; 2,800,018; serial no. 12593, supplied by Henry Dale and Associates, 37 Copse Edge Avenue, Epsom, Surrey, 1960-70.

Anemotherm air meter by Dynamics Corporation of America

1960-1970