Air-Master and Airmaster, were Australian brands used by various radio manufacturers and dealers from 1926 till 19xx.
Below is a chronology of the various, verified, known dealers and or manufacturers of the Air-Master or Airmaster brand.

The Airmaster Radio Co. (Australasia)
500 George Street, Sydney, NSW.

Relevance: Nil, shop only (1926

A short-lived radio shop in Sydney in 1926, founded by Ellen Howell with Yar Kivovitch as Manager.
Kivovitch turned out to be a con man and sent the company into financial ruin.[1]

This company had no known relationship with Air-Master radios. Only mentioned for clarity.

As young man, Raphael Weingott worked for the company and later founded the Kriesler Radio Company in 1931.[2]

Wills and Paton Pty. Ltd.

Relevance: Dealer 1927 - 1930

Started as an Edison gramophone and musical recordings importer in Melbourne in 1916.

The company was granted Trade-Mark registration 46537 for The Air-Master on June 22, 1927.[3]

They sold Air-Master parts and radios from 1927 till 1930. See Wills & Paton for the detailed company history.

Airmaster Radio Co.
Canberra House, Elizabeth Street, Sydney, NSW

Relevance: Dealer & manufacturer, 1928 –

Company was registered on Oct 22, 1928 by Abe Weingott. At present no more information is known about this company.[4]

Targan Electric Co. Pty. Ltd.
131 Brunswick Road, Melbourne, Vic.

Relevance: Dealer & manufacturer, 1930 - 1935

The company manufactured radios under the Targan, Air-Master and Vogue brands. The Airmaster brand was sold through dealerships throughout Australia with the largest sales in the eastern states of Australia.

History:

Walter Stoddart Paton (1887 – 1961) registered the Targan Electric Co. Pty. Ltd., along with Ernest Gerald Ardall in June 1930.[5]

They went into voluntary liquidation in 1935.[6]

Airmaster (S.A.) Radio (1934)
23 Chesser Street, Adelaide SA

Relevance: Dealer

Advertised Airmaster radios manufactured by Targan Electric in April 1934.[7]

Airmaster Radio Co. (Radiokraft Pty. Ltd.) (1935 – 1936)
131 Brunswick Road, Melbourne, Vic.

Relevance: Dealer & manufacturer, 1935 - 1936

Radiocraft purchased the assets of Targan Electric Co. Pty. Ltd., including the Air-Master trademark and manufactured the Air-Master radio, distributed by The Gloria Light Co. Pty Ltd. [8][9]

History:

Radiokraft Pty. Ltd. was registered in September 1935 as manufacturers, importers and wholesale and retail agents with First Directors, Charles James Evans, and Robert Howarth Cogawell.[10]

In August 1936, the company went into liquidation. [11] In late February 1937 the Liquidators called for tenders for the Air-Master trade-mark and complete assets of the company. [ 12]

Air-Master Pty. Ltd. (1937-  19    )
90-98 Chapel Street, St. Kilda, Vic.

Relevance: Dealer & manufacturer

Air-Master Pty. Ltd. was formed to take over the assets of the liquidated parts manufacturer, Colonial Radio Pty. Ltd. in May 1937. [13]

Superheterodynes Pty. Ltd.
90-98 Chapel Street St Kilda, Melbourne, VIC

[1] Smith's Weekly (NSW) Jul 31, 1926, Page 3.
[2] Radio Trade Annual, 1934, Page 294.
[3] Daily Commercial News and Shipping List (NSW)  Jun 22, 1927, Page 8.
[4] Dunn’s gazette(NSW) Oct 22, 1928, Page 367.
[5] Daily Commercial News and Shipping List (NSW) Jul 2,1930, Page 5.
[6] The Argus (Vic.) Feb 27, 1937, Page 25.
[7] The Advertiser(SA)) Apr 7, 1934, Page 7
[8] The Argus (Vic.) Feb 20, 1937, Page25.
[9] Radio Trade annual 1936, Page 371.
[10] The Herald (Vic.) Sep 25, 1935,  Page 5.
[11] The Age (Vic.) Aug 1936, Page 2.
[12] The Argus (Vic.) Feb 20, 1937, Page25.
[13] The Age(Vic.) May 18, 1937 page 8.