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Other levers allowed the chair to rotate ("through the whole circle") and rock back and forth. In addition, minor movements were possible, such as the raising or lowering of the back and headrest, slight rocking of the seat ("to prevent the patient form sliding forward"), footstool length and height adjustment, and the small of the back support ...
Deck chairs; Dentist chair, a deeply reclining chair to allow the dentist easy access to the patient's mouth. The reclining position adjusts as well as the overall height of the chair. Associated with the chair are usually a variety of dental equipment, often including a small tap and sink for the patient to rinse his or her mouth.
Download as PDF; Printable version; ... Pages in category "Dental equipment" ... Wilkerson dental chair This page was last ...
A dental engine is a large chair-side appliance (often including the dental chair itself) for use in a dentist's office. American dentist Josiah Flagg created the first adjustable dental chair in the late 18th century, adapting a wooden chair by adding an instrument tray on one side, as well as a movable headrest.
The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual papermaking, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". [2]
The former government size is still commonly used in spiral-bound notebooks, for children's writing and the like, a result of trimming from the current Letter dimensions. By extension of the American standards, the halved Letter size, 5 + 1 ⁄ 2 in × 8 + 1 ⁄ 2 in (140 mm × 215 mm
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A size chart illustrating the ANSI sizes In 1992, the American National Standards Institute adopted ANSI/ ASME Y14.1 Decimal Inch Drawing Sheet Size and Format , [ 1 ] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".