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1-1/2-inch shatter index 1-inch tumbler index 18-inch retort 47 Lower Kittan 50 Upper Kittan 51 Upper 57 Pocahontas 58 Lower Banner 60 Lower Freeport American Society Apparent Shatter Tumbler apparent specific gravity Average 13 Bed State hours Bed State Retort bituminous coals BM-AGA cokes BM-AGA tests carbonizing rate carbonizing temperature chemical coal carbonized coals yield coke coke-making property cokes from BM-AGA Cont'd greater for coke hardness factor high-volatile A coals hours Apparent inches Carbon index of 900 izing Apparent Shatter low-volatile coals low-volatile rank Lower Hignite lowest shatter index Medium-volatile coals yielded meter MINERAL-MATTER-FREE FIXED CARBON ning washed petrographic Physical properties Pocahontas No.4 Powellton W.Va properties of cokes ranks of coal related closely Retort dia shatter test sizes of retorts Society for Testing specific gravity index stability factor stable coke TABLE tests at 800 tests at 900 true specific gravity Tumbler Coa Tumbler indexes Coa tumbler test yielded stronger coke