ballast covering

释义

道床层；

Toilet cistern with floor valve - has combined ballast-suction lifter, covering intakes in stand-pipe in bell-shape
Method for covering a ballast bed with foam in a railway track system
The Pressing Technology of the Ballast Covering and Die Design
Ballast room cover for a light fixture
Ballast bypass harness assembly for use with a light emitting diode fluorescent tube replacement bulb
Wind-resistant environmental synthetic cover
COVERING THE SPREAD : BY SPEEDING DISTRIBUTION, CONTROLLING FLOW OR PINPOINTING PLACEMENT, SUPPLIERS STRIVE TO MEET RAILROADS' BALLA...
Recessed fixture housing having removable ballast box
NOAA Great Lakes Environmental Research Laboratory (GLERL) NOBOB Vessels as Vectors for Noninigeous Species ####Introductions to the...
Behavior of geogrid-reinforced ballast under various levels of fouling