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A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches ().They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces.
Putlog holes or putlock holes [1] are small holes made in the walls of structures to receive the ends of poles (small round logs) or beams, called putlogs or putlocks, to support a scaffolding. [2] Putlog holes may extend through a wall to provide staging on both sides of the wall.
NEMA 1-15P (two-pole, no ground) and NEMA 5-15P (two-pole with ground pin) plugs are used on common domestic electrical equipment, and NEMA 5-15R is the standard 15-ampere electric receptacle (outlet) found in the United States, and under relevant national standards, in Canada (CSA C22.2 No. 42 [1]), Mexico (NMX-J-163-ANCE) and Japan (JIS C 8303).
An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.
This technique can be used with a special "pear-shaped" HMS locking carabiner, or any locking carabiner wide enough to take two turns of the rope. In the late 1950s, three Italian climbers, Mario Bisaccia, Franco Garda and Pietro Gilardoni developed a new belay technique called the "Mezzo Barcaiolo (MB) meaning; "a half of the knot, which is ...
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