The larger shed on the right belongs to the site owners WANG (West Australian Natural Gas) and the smaller garden shed, WARG's. 

This garden shed is not the original housing, which was a weather proofed chip board cabnet, but no photos have yet been found of this housing.

This garden shed remained for about 20 years before it was replaced with the existing much larger enclosure. 
The inside of the garden shed was insulated and at a latter date had an air conditioner fitted.