Airzone Valve Radio

Airzone started manufacturing crystal sets in 1925. In 1928 they moved to Parramatta Road at Camperdown in Sydney and expanded to 750 employees.
The Airzone trademark registered earlier in July 1926 and on 16 February 1927, Airzone Ltd. was incorporated.
In September 1931, Airzone Ltd. was liquidated and the company was reorganised as a public company, Airzone 1931 Ltd., with 9000 ordinary and 1000 employee shares at £1 each.
By 1936 the factory floor area was over 3400 square metres.
At different stages in World War II the factory produced instruments for testing radar and electrical communications, assembled grenades and made asdic equipment.
On the 24 June 1946, the company was taken over by Electricity Meter and Allied Industries Ltd. (EMAIL), who had taken over Emmco in 1936 and were manufacturers of Philco brand sets. After the takeover, Plowman remained as manager of Airzone.
After 1948 both Airzone and Philco branded sets were the same.
Radio production finished end of 1955, after which Airzone branded radios were manufactured by AWA.
Sir Claude Plowman (1895-1954)
As a senior member of the Royal Yacht Club of Tasmania, he was prominent in the 1945 discussions that led to the establishment of the Sydney-Hobart Yacht Race. He skippered the Morna to three successive, first-cross-the-line wins from 1946.
He was knighted in 1948 for services to industry and yachting.

https://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=7119