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Blades may also be damaged by being corroded by acid (as when cutting lemons or tomatoes) or by high temperatures and corrosive chemicals in a dishwasher. If a knife is used as a scraper, a pry-bar, or encounters hard particles in softer materials, there may be a sideways load at the tip, causing bending damage. [3] Blade damage is avoided by:
A macuahuitl ([maːˈkʷawit͡ɬ]) is a weapon, a wooden sword with several embedded obsidian blades. The name is derived from the Nahuatl language and means "hand-wood". [2] Its sides are embedded with prismatic blades traditionally made from obsidian, which is capable of producing an edge sharper than high quality steel razor blades. The ...
The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.
The thick grip of these safety razors can be reused. Gillette realized that a profit could be made by selling an inexpensive razor with disposable blades. This has been called the razor and blades business model, and has become a very common practice for a wide variety of products. Many other brands of safety razors have come and gone.
Harry's razor blades are manufactured at Feintechnik GmbH Eisfeld in Eisfeld, Germany. [9] Feintechnik was founded in 1920, [29] and was later nationalised in 1948 as VEB Feintechnik Eisfeld, [30] [31] which later privatized by German government agency Treuhand in 1990. [31] Feintechnik was acquired by Harry's in January 2014 for $100 million.
In 1900, Nickerson was asked to review King C. Gillette's razor idea, which he did, but did not meet or become involved with Gillette at that time. [16] In 1901, Nickerson was again asked to review Gillette's razor. [17] This time, after longer review, he "envisioned machinery that would harden and sharpen the thin steel blades to a keen ...
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