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A sliding glass door. In architecture and construction, a sliding glass door (also patio door or doorwall [1] [2]) is a type of sliding door made predominantly from glass, that is situated in an external wall to provide egress and light.
A large area of glass can also be added between the sun room and the interior living quarters. Low-cost, high-volume-produced patio door safety glass is an inexpensive way to accomplish this goal. The doors used to enter a room should be opposite the sun room interior glass, so that a user can see outside immediately when entering most rooms.
Sliding scale fees are variable prices for products, services, or taxes based on a customer's ability to pay. Such fees are thereby reduced for those who have lower incomes, or alternatively, less money to spare after their personal expenses, regardless of income. [1] Sliding scale fees are a form of price discrimination or differential pricing.
The scarcity of wood necessitated innovation in construction techniques. The use of scarf joints to join two shorter pieces together and form a longer beam was one example of this, [17] as well as construction of veneers in which low quality cheap wood was used as the main building material, with a thin layer of expensive wood on the surface. [18]
[49] In 1968 the standard Fuller cost about $50 at a time when an electronic Hewlett-Packard HP 9100A desktop calculator (weighing 40 pounds (18 kg)) cost just under $5000. [50] [51] But in 1972 Hewlett-Packard introduced the HP-35, the first handheld calculator with scientific functions, at $395 – the Fuller went out of production the next year.
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