US2870565A
|
|
Powder-disseminating device
|
US2696308A
|
|
Screening apparatus
|
US2765920A
|
|
Granular bed filter
|
US2715964A
|
|
Granular bed filter
|
US2693873A
|
|
Screw conveyer
|
US2676006A
|
|
Continuous furnace for converting material
|
US2655883A
|
|
Apparatus for heat treatment of sewage sludge and method adapted to be carried out therein
|
US2471882A
|
|
Means for converting material
|
US2521591A
|
|
Apparatus for converting crushed material
|
US2511281A
|
|
Apparatus for converting material
|
US2361557A
|
|
Multiple hearth furnace
|
US2332387A
|
|
Rabbling means for multiple hearth furnaces
|
CA532269A
|
|
Continuous furnace for converting material
|
CA461007A
|
|
Means for converting material
|