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An eraser (also known as a rubber in some Commonwealth countries, including South Africa [1] [2] [3] from which the material first used got its name) is an article of stationery that is used for removing marks from paper or skin (e.g. parchment or vellum). Erasers have a rubbery consistency and come in a variety of shapes, sizes, and colors.
The working face of the suction cup is made of elastic, flexible material and has a curved surface. [3] When the center of the suction cup is pressed against a flat, non-porous surface, the volume of the space between the suction cup and the flat surface is reduced, which causes the air or water between the cup and the surface to be expelled past the rim of the circular cup.
The company was founded in 1905 as "Trelleborgs Gummifabriks AB" (the Rubber Factory Corporation of Trelleborg) by Henry Dunker and Johan Kock, who were both already active in the rubber industry. Initially, the company had 150 employees and produced bicycle tires and rubber for industrial applications.
The crown cork (also known as a crown seal, crown cap or just a cap), the first form of bottle cap, was invented by William Painter in 1892 in Baltimore. The company making it was originally called the Bottle Seal Company, but it changed its name with the almost immediate success of the crown cork to the Crown Cork and Seal Company .
The speed opener is a flat blade of steel approximately 4 cm wide and 16 cm long with a thumb hole at one end and a letterbox cut at the other to remove the crown seals from a bottle. They go under the names 'speed opener', 'popper', 'mamba', 'bar key', and most popularly 'bar blade'.
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