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A leather watch strap with a butterfly closure Four analog wristwatches for men with variants of the widespread metal watch strap made from stainless steel, the two in the middle being of the most common type. A watch strap, watch band, watch bracelet or watch belt is a bracelet that straps a wrist watch onto the wrist. [1]
Pallet fork with jewel pallets (pink) The pallet fork is above the balance wheel in this watch movement. The pallet fork is a component of the lever escapement of a mechanical watch. [1] The pallet fork and the lever form one component that sits between the escape wheel and the balance wheel. Its purpose is to lock the escape wheel, and release ...
The hip replacement operation, in which a stainless steel stem and 22mm head fit into a polymer socket and both parts are fixed into position by PMMA cement – pioneered by John Charnley; Description of Hay fever – John Bostock in 1819; Pioneering the use of surgical anaesthesia with Chloroform: Sir James Young Simpson (1811–1870) [171]
1960 onwards: The hip replacement operation (in which a stainless steel stem and 22mm head fit into a polymer socket and both parts are fixed into position by PMMA cement) pioneered by John Charnley (1911–1982). 1960s: First use of sodium cromoglycate for asthma prophylaxis associated with Roger Altounyan (1922–1987). [96]
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