Local & International Porcelain Manufacturers & Markings - Past & Present
Insulator Markings	Company Name	Location of Production
"R.F. Ltd." or "Fowler"	Robert Fowler Ltd.	New South Wales.
"W"	Welland	South Australia.
"S#"/SUNSHINE	Sunshine Potteries	Victoria.
"KP"	Koster Potteries (Products)	South Australia.
"NZI"	New Zealand Insulators	New Zealand
"FB"	Fire Brick & Tile Co.	Victoria.
"SLATER'S ACME"	SLATER'S ACME	Victoria.
"RABONE FEEZ"	Rabone Feez Ltd.	Victoria.
"WESTMINSTER"	?	?
"MI" or "Morlynn"	Morlynn Insulators	Victoria
"DIA"	Doulton Industries Australia	Victoria
"Shofu" - Occupied/Japan	Shofu	Japan
"MB" - Occupied/Japan	MB	Japan
"Z[Year]"	?	Japan
"??B.I. & H.G.?? "	?	Most likely British.
"Doulton"	Doulton	Staffordshire & Tamworth, England
"Bullers Limited/Ltd. London ['Hand holding insulator']"	Bullers Limited	London, England (HQ)
"G&G - English Make"	G&G	Stoke-on-Trent, England
"J[Number]"	Unknown	Unknown/possibly Australia

Note: This list will be added onto when time permits.