hard block

anchor wedge block

Inversed Wedge Block

soft wedge block

upright wedge block

Wedge Block

Hard Roof and Hard Coal

Hard Roof and Hard Floor

2 atrioventricular block and complete atrioventricular block

Block 36 and Block 38 in Oman

Block Xia 502 and Block Xia 509

(semi) hard process

3 channels hard cholecystoscope

A Good Man Is Hard to Find

a hard case

a hard nut to crack

a hard row to hoe

a hard sphere unit

Abnormal hard tissue formation in pulp