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[1] [3] By the 1960s had an estimated 80 percent of the black hair-care market and annual sales of $12.6 million by 1970. [1] In 1971, JPC went public and was the first African American owned company to trade on the American Stock Exchange. [1] [5] The company's most well-known product was Afro Sheen for natural hair when afros became popular.
Indium wire is used as a gasket in demountable seals. Gold wire is used as a gasket in demountable seals for ultra-high vacuum, as well as an alternative to lead-tin solder for making electrical connections. Platinum is a highly chemically inert material with high cost and low outgassing. Zirconium is corrosion-resistant.
Ultra-black is one of the darkest shades of the color black.An ultra-black substance is defined as reflecting less than 0.5% of the light that hits its surface. [1] This color is part of the natural coloration of some species of birds-of-paradise, butterflies, and fishes, and ultra-black components are used in telescopes, cameras, and solar panels to improve the efficiency of light capture.
Copper flange gaskets used for ultra-high vacuum systems. A flange gasket is a type of gasket made to fit between two sections of pipe that are flared to provide higher surface area. Flange gaskets come in a variety of sizes and are categorized by their inside diameter and their outside diameter. There are many standards in gasket for flanges ...
The term black lead usually refers to a powdered or processed graphite, matte black in color. Abraham Gottlob Werner coined the name graphite ("writing stone") in 1789. He attempted to clear up the confusion between molybdena, plumbago and black lead after Carl Wilhelm Scheele in 1778 proved that these were at least three different minerals.
While the viewable area may be rectangular, the edges of the CRT may have a curvature (e.g. black stripe CRTs, first made by Toshiba in 1972) [132] or the edges may be black and truly flat (e.g. Flatron CRTs), [112] [132] [172] or the viewable area may follow the curvature of the edges of the CRT (with or without black edges or curved edges).