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Greenlee is an American industrial and electrical tool company headquartered in Rockford, Illinois.It was founded in 1862 by twin brothers Robert L. and Ralph S. Greenlee to manufacture their invention called a hollow chisel mortiser, consisting of a drill surrounded by four chisel blades used in making mortises (the hole) for mortise and tenon joints, for the furniture industry in Rockford. [1]
The direct metal mastering (DMM) process uses a copper-coated rather than lacquer-coated disc. Before lacquer discs, master recordings were cut into blank wax discs. Once complete, this master disc is used to produce matrices from which the record is pressed. For all intents and purposes, the finished record is a facsimile of this master disc. [1]
Then, in 1949, he invented a machine that transformed the job of resurfacing an ice rink from a five-man, 90-minute task to a one-man, 15-minute job. [4] The initial machine included a hydraulic cylinder from an A-20 attack plane, a chassis from an oil derrick, a Jeep engine, a wooden bin to catch the shavings, and a series of pulleys.
Within 15 years, the entire part-cutting cycle had been mechanically automated, and machines of the 1860 type were retronymously called semi-automatic. From that time on, machines with fully automated cycles were usually called automatic screw machines, and eventually, in the usage of most people in the machining industries, the term screw ...
These machines have either a rotary (disk) or cylindrical scrubbing head and an automated system for dispensing cleaning solution and then vacuuming it up. So, in one pass over the floor, a user can dispense a cleaning agent, scrub it into the floor, then vacuum it all up with an autoscrubber squeegee attached at the back of the machine. Auto ...
For a machine that cost $500, this was a relatively novel idea. [3] Regina shipped 100,000 music boxes between 1892 and 1921, with sales topping out over $2 million a year. The company had 325 employees, and even as Symphonion established an American branch, Regina thrived as the market leader.
(Facit-Odhner was a sub-sidiary of Facit) Facit calculating machine, 1954 Elof Ericsson (1887–1961), founder in 1922 of AB Åtvidabergs Industrier. Photo from 1937. Photo from 1937. Facit ( Facit AB ) was an industrial corporation and manufacturer of office products including furniture.
A disc harrow is the preferred method of incorporating both agricultural lime (either dolomitic or calcitic lime) and agricultural gypsum, and disc harrowing achieves a 50/50 mix with the soil when set correctly, thereby reducing acid saturation in the top soil and so promoting strong, healthy root development.