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In 1936 Henry F. Phillips, also once a traveling salesman, patented the cruciform head known to us all. It was first used by General Motors in the 1936 Cadillac, and within three years most screw makers produced Phillips head screws under license from the inventor.The first screwdriver the author found was in the late fifteenth-century castle manual cited above. It appears in the careful drawing of a screw-cutting lathe and was used to adjust the cutter. "Eureka!I''ve found it. The first screwdriver. No improvised gadget but a remarkably refined tool, complete with a pear-shaped wooden handle to give a good grip, and what appears to be a metal ferrule where the metal blade meets the handle....there is no doubt that a full-fledged screwdriver existed three hundred years before the tool portrayed in the Encyclopedie." Since the lathe was shown in a chapter devoted to machines of war "it is likely that screwdrivers appeared first in military workshops, though perhaps not in France, as I had assumed, but in Germany"
DERRICK: Pyramid, 160'' x 30'' x 30'', 1,044,000-1b hook load.BOP SYSTEM: One Shaffer 5,000 psi spherical,One single and one double Cameron U 13 5/8", 10,000 psi.CRANES: Three LeTourneau PCM 120''s w/100''booms. Rated for 48 t @ 26'' radius.REMARKS: Cantilever structure can be extended 40'' from stern.WORK AREA: Gulf of Mexico.OCEAN CRUSADERRIG DESIGN: JU-200 MCCONSTRUCTION: Bethlehem Shipbuilding, Singapore, 1982.PERFORMANCE: Water depth--200''; Drilling depth--20,000''.QUARTERS: 80 persons, plus 3-man sick bay.
Though light in weight, Airbor magnetic drill has a powerful 1.6-hp air motor and 1,600-lb magnetic holding strength. With its extra rack, stroke length is extended to 10 1/4 in. Annular cutter capacity is up to 2 1/16 in. diam. Geared chuck adapter converts the unit to a standard drill press. The Slugger Air Force pneumatic drill, at 24 lbs, 6 1/4" high, is useful for confined area drilling. The drill''s features include a permanent magnet that turns on or off by air power, a cutter capacity of up to 1 1/16" diameter x 3/4" depth and the ability to use ShortSlugger cutters and frame cutters. These cutters'' geometry allows the operator to drill multi-layered truck frames in a single pass.
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