block gage (gage block) (slip gage)
brace slip block organization
Johanson(JO) block gage
block and block [= chocka-block
2 atrioventricular block and complete atrioventricular block
BDCB Block Device Control Block
Block 36 and Block 38 in Oman
block by block relaxation operator
block by block transfer
Block Xia 502 and Block Xia 509