|
US1804073A
|
|
Carbonizing apparatus
|
|
GB221388A
|
|
Improvements in processes of carbonizing
|
|
DE398774C
|
|
Bottom lock for standing smelters
|
|
GB204335A
|
|
Improvements in or relating to apparatus for extracting oil from shale or the like
|
|
DE399227C
|
|
Distillation of bituminous substances
|
|
GB211033A
|
|
Improvements in the destructive distillation of shale and the like to obtain oil therefrom
|
|
US1491290A
|
|
Apparatus for distilling oil shales and the like
|
|
US1607241A
|
|
Apparatus for distilling oil shales and the like
|
|
US1607240A
|
|
Process of distilling oil shales and the like
|
|
US1469628A
|
|
Treatment of oil shale
|
|
CA267159A
|
|
Carbonizing process
|
|
CA239089A
|
|
Apparatus for discharging retorts
|
|
CA235479A
|
|
Distillation of shales
|
|
DE406409C
|
|
Smoldering or charring of shale coal, lignite, etc. like
|
