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I've never seen Linde ever in my life (Australia).

What is funny though, at least in the Australia and UK regions, they still use the BOC brand, which is a subsidiary under Linde.

Linde was definitely around as a distinct brand in Australia before they bought BOC in 2006, but since then as you said, they now just trade as BOC.

Competitors in the space in Australia include Air Liquide and Supagas.

Supagas tend to have better prices for smaller operators, and hobbyists.