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The Houston tunnel system is a network of subterranean, climate-controlled, pedestrian walkways that links 95 full city blocks 20 feet (6 m) below Houston's downtown streets. It is approximately six miles (9.7 km) long. [1] There are similar systems in Chicago, Dallas, Oklahoma City, Montreal, and Toronto.
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For a single wood utility pole structure, a pole is placed in the ground, then three crossarms extend from this, either staggered or all to one side. The insulators are attached to the crossarms. For an "H"-type wood pole structure, two poles are placed in the ground, then a crossbar is placed on top of these, extending to both sides.
By 1969/70, winch systems for the lighting systems were developed and several 175 ft (53 m) towers were installed in Dallas and Houston, followed soon thereafter by 200 ft (61 m) towers. Houston is believed to be the world's leading city of high-mast illumination along its freeways.
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Mountain guide Alice Manfield with a long wooden walking pole in the early 1900s. When in use, modern trekking poles resemble ski poles as they have many features in common, such as baskets at the bottom to prevent the pole sinking through unstable surfaces, and rubber-padded handles and wrist straps to strengthen holding grip. Their maximum ...
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