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A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
Hard barriers are fixed or removable guards which prevent entry. These include fences, traffic barriers, and crush barriers. Soft barriers are devices such as light curtains. They detect the presence of a foreign body and are tied into the control circuit to stop the machine. [2]
Small mushroom-bollards are found on lock approaches for advancing boats waiting for lock access. [ citation needed ] A conventional measure of the pulling or towing power of a watercraft is known as bollard pull , and is defined as the measured force exerted by a vessel under full power on a shore-mounted bollard through a tow-line.
Security posts known as bollards were not in place before a suspect drove a truck into a crowd in the French Quarter of New Orleans early on New Year's Day, killing 14 and injuring at least 35.
A look back at how "48 Hours" covered the 1996 Christmastime murder of JonBenét Ramsey in 2002, and what her father John Ramsey says about the unsolved Colorado case nearly 28 years later.
Here are the 10 best and 10 worst states for property taxes. ... Living on the East Coast near the beach sounds perfect. What makes it even better? A low property tax rate. The Palmetto State has ...
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