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A number of designs of letterboxes and mailboxes have been patented, particularly in the United States. One design was the visible mailbox (because it was made of transparent glass) with a flip-up aluminium lid produced during the first part of the 20th century by George F. Collins of the Barlet-Collins Glass Company in Sapulpa, Oklahoma. [4] [5]
A post in ground construction, also called earthfast [1] or hole-set posts, is a type of construction in which vertical, roof-bearing timbers, called posts, are in direct contact with the ground. They may be placed into excavated postholes , [ 2 ] driven into the ground, or on sills which are set on the ground without a foundation.
In 1974 the Post Office experimented with a similar rectangular design known as Type G. This was made in traditional cast iron by the foundry of Carron Company near Falkirk , Scotland. It was an operational success, but the public disliked the "square" designs and petitioned the Post Office for a return to cylindrical boxes.
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The term post is the namesake of other general names for timber framing such as post-and-beam, post-and-girt construction and more specific types of timber framing such as Post and lintel, post-frame, post in ground, and ridge-post construction. In roof construction such as king post, queen post, and crown post framing
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