Original Patent - R. Dempster , J. Broadhead and F. Ordish in Elland , 1905 , Discharge apparatus for gas retorts !!!

Original Patent - R. Dempster , J. Broadhead And F. Ordish In Elland , 1905 , Discharge Apparatus For Gas Retorts !!! - Other & Unclassified
Original Patent - R. Dempster , J. Broadhead And F. Ordish In Elland , 1905 , Discharge Apparatus For Gas Retorts !!! - Other & Unclassified
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