Commonwealth Bureau of Census and Statistics2025-09-172025-09-1712.16.52https://hdl.handle.net/1885/733779610application/pdfen-AUProduction Summary No.52, Electrical Power Frequencies, Transformers, Chokes, and Ballasts, April 19681968-04This image is provided for research purposes only and must not be reproduced without the prior permission Australian National University.