|
DE595956C
|
|
Circulating recuperative flue gas air heater
|
|
GB211756A
|
|
Improvements in or relating to air-filters
|
|
DE402273C
|
|
Vertical tube boiler with a nozzle-like circulation device arranged between the rising and falling pipes of a water drum
|
|
DE332163C
|
|
Filter press with frame, the filter cloth of which is held apart by bars
|
|
DE459732C
|
|
Stuffing box with cushioned pressure on the packing to seal turbine shafts
|
|
DE463344C
|
|
Sleeveless angle lever centrifugal governor
|
|
DE540495C
|
|
Ball mill with grinding balls rotating in a vertical plane
|
