wedge block with two inclined planes
block and block [= chocka-block
Hard Roof and Hard Coal
Hard Roof and Hard Floor
hard-soft-hard sandwich media
conditions of wedge caulking and wedge refunding
Cross-wedge rolling with multi wedge
Multi-wedge cross wedge rolling
2 atrioventricular block and complete atrioventricular block
BDCB Block Device Control Block