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Green's Catalog of the Tuberculosis Seals, US National Christmas Seals is a seminal philatelic catalog written by Dick Green, a pioneer member of The Christmas Seal & Charity Stamp Society. Green began his work in the 1920s and portions first appeared as a series in The Western Stamp Collector , a stamp collecting weekly.
This Catalog is divided into 10 sections which catalog hundreds of fundraising seal issuing societies such as, Easter Seals (U.S.), Boys Town (organization) listed in the Catholic section, National Wildlife Federation, listed in the Pets, Plants, and Wildlife section, and National Association for the Advancement of Colored People listed in the ...
The Christmas Seal Catalog (PDF). The Christmas Seal and Charity Stamp Society. The Christmas Seal Catalog is a simplified version of Green's Catalog of TB Seals of the World, part 1, U.S. National Christmas Seals. Denune, John. "US Christmas Seals Tied On". John Denune's ChristmasSeals.net
A gladhand connector or gladhand coupler is an interlocking hose coupling fitted to hoses supplying pressurized air from a tractor unit to air brakes on a semi-trailer, [1] or from a locomotive to railway air brakes on railroad cars. [2] Gladhand connectors resemble a pair of "hands shaking" when interlocked, hence the name. [1]
A static hydraulic seal is located in a groove and sees no movement - only sealing within its confined space, acting like a gasket. To achieve this the gasket should be under pressure. The pressure is applied by tightening of the bolts. Examples of static seals include O-rings, flange seals, and cover seals. Dynamic
Pneumatic cylinder, also known as air cylinder, is a mechanical device which uses the power of compressed gas to produce a force in a reciprocating linear motion. [ 1 ] : 85 Like in a hydraulic cylinder , something forces a piston to move in the desired direction.
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In mechanical engineering, a diaphragm seal is a flexible substance that seals and isolates an enclosure. The flexible nature of this seal allows pressure effects to cross the barrier but not the material being contained. Common uses for diaphragm seals are to protect pressure sensors from the fluid whose pressure is being measured.