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David Littmann (July 28, 1906 – January 1, 1981) was an American cardiologist and Harvard Medical School professor and researcher. [1] The name Littmann is well known in the medical field for the patented Littmann Stethoscope reputed for its acoustic performances for auscultation .
The most important of the tools used in line-engraving is the burin, or graver, a bar of steel with one end fixed in a handle, somewhat resembling a mushroom with one side cut away. The burin is shaped so that the sharpened, cutting end takes the form of a lozenge , and points downward.
Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving. Steel engraving is the same technique, on steel or steel-faced plates, and was mostly used for banknotes, illustrations for books, magazines and reproductive prints, letterheads and similar uses from about 1790 to the early 20th century, when the technique became less popular, except ...
A burin diagram, showing the handle, shaft, cutting tip, and face. [1] The bend in the shaft is especially associated with wood engraving. [2]A burin (/ ˈ b j ʊər ɪ n, ˈ b ɜːr ɪ n / BUR(E)-in) is a steel cutting tool used in engraving, from the French burin (cold chisel).
Some automobile dealers try to include VIN etching as an extra service to boost their profit margin when selling a vehicle; [16] [17] they may even pre-print a charge for VIN etching on the bill of sale, as if to suggest that VIN etching is mandatory rather than an optional, add-on service.
Laser engraving metal plates are manufactured with a finely polished metal, coated with an enamel paint made to be "burned off". At levels of 10 to 30 watts, excellent engravings are made as the enamel is removed quite cleanly. Much laser engraving is sold as exposed brass or silver-coated steel lettering on a black or dark-enamelled background.
Stipple engraving is a technique used to create tone in an intaglio print by distributing a pattern of dots of various sizes and densities across the image. The pattern is created on the printing plate either in engraving by gouging out the dots with a burin , or through an etching process. [ 1 ]
By 1959, Thor Power Tool Company's annual volume had surpassed $30 million. [2] By the early sixties, Thor Power Tool Company was acquired by the Stewart-Warner Corporation. A short time later, Neil C. Hurley, Jr. died from a third heart attack, February 9, 1965, at the age of 54 and the Thor brand name almost died.
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