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NOK's business is conducted by three main companies(主要三社): NOK, Eagle Industries(EKK) and Nippon Mektron(MEK). [5] NOK primarily develops and manufactures oil seals and manages R&D of the group. EKK handles the mechanical seal business, expanding into industrial and aviation field. The electronical components business is conducted by MEK.
A Wills Ring or Cooper Ring is a form of all-metallic O-ring seal. They are used for extremely arduous service, such as sealing the head gasket of high performance piston engines . Hollow, metallic Wills Rings are used as they have better springback than yielding soft metal seals and higher temperature limits than elastomer O rings.
Typical O-ring and application. An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.
The mint mark, if present, appears on the reverse above between D and O in "Dollar". The dollar was authorized by the Bland–Allison Act . Following the passage of the 1873 act, mining interests lobbied to restore free silver, which would require the Mint to accept all silver presented to it and return it, struck into coin.
A retaining ring is a fastener that holds components or assemblies onto a shaft or in a housing/bore when installed - typically in a groove - for one time use only. Once installed, the exposed portion acts as a shoulder which retains the specific component or assembly.
The Raschig Super Ring represents a further development of the same concepts behind the Pall ring. It optimises the production of turbulent film-type flows and prevents the formation of drops. [8] The 'rings' no longer resemble rings but are pressed from metal sheet in the form of wave shapes of narrow strips.
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The Standard Catalog of World Paper Money was a well-known catalogue of banknotes that was published by Krause Publications in three volumes. These catalogues are commonly known in the numismatic trade as the Pick catalogues, as the numbering system was originally compiled by Albert Pick, but are also referred to as "Krause" or "SCWPM".