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Clean-outs are fittings with removable elements, allowing access to drains without removing plumbing fixtures. They are used to allow an auger (or plumber's snake) to clean out a plugged drain. Since clean-out augers are limited in length, clean-outs should be placed in accessible locations at regular intervals throughout a drainage system ...
Sink strainer. In plumbing, a sink strainer is a type of perforated metal sieve or mesh strainer used to strain or filter out solid debris in the water system. Different varieties are used in residential premises and for industrial or commercial applications. Such strainer elements are generally made from stainless steel for corrosion resistance.
Waterstop. A waterstop is an element of a concrete structure, intended to prevent the passages of fluids (such as water) when embedded in and running continuously through concrete joints. Waterstops are grouped in two distinct categories. Waterstops for joints without any movement of the adjoint concrete sections (construction cold joints) and ...
In 18th-century North America, smokers used a "tobacco-stopper" to press tobacco into the pipe’s bowl, with some of these stoppers made from bones, such as those extracted from the male anatomy of raccoons, reflecting the resourcefulness of the era’s material culture.
The Monobloc was developed by Pierre Robin (surgeon) in 1902 and is considered to be one of the first functional appliances in Orthodontics. The Monobloc was a modification of Ottolengui's removable plate. In 1908, Viggo Andersen developed the Activator appliance. This was the first functional appliance to be widely accepted, especially in Europe.
Retainer (orthodontics) Top (left) and bottom (right) retainers. Vacuum form retainer in the foreground (used on upper); illustration of an early Hawley retainer in the background. Orthodontic retainers are custom-made devices, usually made of wires or clear plastic, that hold teeth in position after surgery or any method of realigning teeth.
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