Item duplication. 1  Step 1. Have the block you want to duplicate in front of you. ( 2 Examples: Diamond, Gold, or Iron.). 3  Step 2. 4  Now you might want to have a Iron pickaxe or Diamond pickaxe. 5  Step 3. Use you'r pickaxe to quickly mine it.
Heavy Duty/Industrial. A backdraft damper is an isolation damper allowing air in one direction only. Greenheck's HB damper series is designed to prevent back flow at static pressures and velocities up to 20 in. wg and 6400 fpm, respectively.
But wait that's not all. If you look closely at the below picture you'll find a black part too that runs inside the spring. This is a shock absorber/damper which is also a part of vehicle suspension setup. In short : The coil springs help in energy absorption whilst the dampers help in energy dissipation. Had there been no dampers and only springs the vehicle would have continued to oscillate back and forth until the vibrations died out of natural damping.