Commonwealth Bureau of Census and Statistics2025-09-182025-09-1812.16.52https://hdl.handle.net/1885/733780719application/pdfen-AUProduction Summary No.52, Electrical Power Frequencies, Transformers, Chokes, and Ballasts, November 19691969-11This image is provided for research purposes only and must not be reproduced without the prior permission Australian National University.