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The chair screw has a higher cost to manufacture than the rail spike, but has the advantage of greater fixing power—approximately twice that of a rail spike [18] —and can be used in combination with spring washers. [17] The chair screw was first introduced in 1860 in France (French tire-fond) and became common in continental Europe. [19]
The first coated metal roofing tiles to be made in New Zealand were produced by Martile Roofing Ltd in Howick in 1956 and were pressed from an aluminium manganese alloy. They were then coated with High Bake Enamel. By 1957, L.J. Fisher had bought the rights to use the Martile profile from A.L.W. Martinsen and Son Ltd and was producing his own tile.
F/n = 23 kN per anchor during site lifting (n = 2 lifting anchors) Reference to the load capacity tables provided by the anchor manufacturer is required to make an anchor selection for the specific concrete strengths at the time of lifting. Hence the great of the two calculated anchor capacities required at the concrete strength of the initial ...
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If the new ticket is for a lower class of service, the air carrier would have to refund the cost difference; if the booking is in a higher class of service, passengers cannot be charged extra.
Corrugated metal roofs are similar in price to asphalt shingle roof installation. The fasteners are screwed through the metal into the roof requiring more maintenance to make sure the screws stay secured. Corrugated metal roofs can last 30–45 years with proper maintenance. [citation needed]
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