crown block meaning in Hindi

Examples

1. Zirconia, conventional porcelain-to-metal, and traditional gold and other all-metal crowns block x-ray radiation, disallowing evaluation over time.
2. The combination of the traveling block, crown block and wire rope drill line gives the ability to lift weights in the hundreds of thousands of pounds.
3. The pipe tore off the derrick's crown block, 58 feet straight up, before plunging back to earth in broken, 20-foot sections, like javelins tossed by a giant.
4. Mud spurted out of the 1, 020-foot well, followed by an explosion of gas that shot the drill bit and hundreds of feet of pipe out of the hole and up through the derrick, knocking off its crown block.