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oxy-coal-gas
oxy-coal-gas n.
Brit. 
/ˌɒksɪkəʊlˈɡas/
, /ˌɒksɪkəʊlˈɡas/U.S. /ˌɑksiˌkoʊlˈɡæs/
/ˌɑksiˌkoʊlˈɡæs/ΚΠ
1887 Proc. Royal Soc. 43 119 (heading) Experiments upon the luminous phenomena of the various metals volatilised in the bunsen burner and the oxy-coal-gas blowpipe flame.
1936 E. A. Atkins & A. G. Walker Electr. Arc & Oxy-acetylene Welding (ed. 3) i. 7 The use of the oxy-coal gas welding is confined to low temperature work such as lead burning, brazing, etc.
1989 A. C. Davies Sci. & Pract. Welding (ed. 9) I. i. 46 The oxy-coal-gas flame is very similar [to the oxy-hydrogen flame], as the coal gas consists of hydrogen, together with other impurities.
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