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Cultivator No. 6 was the code name of a military trench-digging machine developed by the British Royal Navy at the beginning of World War II.The machine was originally known as White Rabbit Number Six; this code name was never officially recognised, but it was said to be derived from Churchill's metaphorical ability to pull ideas out of a hat.
Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...
Subsidence craters remaining after underground nuclear (test) explosions at the north end of the Yucca Flat, Nevada test site. A nuclear bunker buster, [1] also known as an earth-penetrating weapon (EPW), is the nuclear equivalent of the conventional bunker buster.
They apply three kinds of force to the task of advancing a tri-cone drill bit into rock. Bit-loading force up to 150,000 pounds-force (670,000 N) combines with up to 25,000-foot-pound-force (34,000 N⋅m) of torque and large volumes of compressed air flowing at nearly 3,850 cubic feet (109 m 3) per minute create the tubes or "blast holes." The ...
The company founded (as the Drott Tractor Company) by Edward Drott in 1916. [1] The company was based in Butternut, Wisconsin before moving to Wausau, Wisconsin.In 1923, after several re-organizations, it became the Drott Manufacturing Company.
js215LC tracked backhoe excavator in the Himalayas (elev. 3,770 m (12,370 ft). Many of the vehicles produced by JCB are variants of the backhoe loader, including tracked or wheeled variants, mini and large version and other variations, such as forklift vehicles and telescopic handlers for moving materials to the upper floors of a building site.
M1895 operating mechanism showing the lever (P) in the forward (top) and rear (bottom) positions. Filed for patent in 1892, the M1895's operating mechanism is one of John and Matthew S. Browning's early patents for automatic rifles; [10] [11] they had previously been working on lever-action rifles for Winchester such as the Winchester 1886.
The first successful tunnelling shield was developed by Sir Marc Isambard Brunel to excavate the Thames Tunnel in 1825. However, this was only the invention of the shield concept and did not involve the construction of a complete tunnel boring machine, the digging still having to be accomplished by the then standard excavation methods.