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Spring scissors continued to be used in Europe until the 16th century. However, pivoted scissors of bronze or iron, in which the blades were pivoted at a point between the tips and the handles, the direct ancestor of modern scissors, were invented by the Romans around 100 AD. [6]
The thin cutting edges of knife blades, such as those of a pair of scissors, are always ground lengthwise. The thin cutting edges of knife blades are particularly susceptible. The simplest device, which can still be seen in folklore museums, is a mobile, elongated and open water box, into which the round whetstone protrudes halfway from the top.
Bypass pruners usually work exactly like a pair of scissors, with two blades "passing by" each other to make the cut. At least one of the blades will be curved: a convex upper blade with either a concave or straight lower one. Some bypass designs have only one blade, the lower jaw being broad (like an anvil) but passing the upper jaw.
Pinking shears are scissors with saw-toothed blades instead of straight blades. They produce a zigzag pattern instead of a straight edge. Before pinking scissors were invented, a pinking punch or pinking iron was used to punch out a decorative hem on a garment.
Mayo scissors have semi-blunt ends and they are either straight or curve-bladed. [5] The straight blades are used for cutting tissue near wounds, and curves are used for cutting thick tissue. [5] Metzenbaum scissors were invented by Myron Metzenbaum (1876–1944). [5] This tool was widely used for tonsillectomy (the surgical removal of the ...
Generalized rock-paper-scissors games where the players have a choice of more than three weapons have been studied. [54] Any variation of rock paper scissors is an oriented graph, where the nodes represent the symbols (weapons) choosable by the players, and an edge from A to B means that A defeats B. Each oriented graph is a potentially ...
Wilkinson Sword Hydro 5: A 5-blade razor system with "skin guards advanced hydrating gel and a flip trimmer". Wilkinson Sword Hydro 3: A 3-blade razor system similar to the 5-blade system but all for a flip trimmer. Wilkinson Sword Hydro Silk: A 5-blade women's razor system. Introduced in mid-2012 as a Schick model; added to the Wilkinson Sword ...
The first such blades were made by the Wilkinson firm, famous maker of ceremonial swords, in Sheffield. [11] Soon Gillette, Schick, and other manufacturers were making stainless steel blades. These were followed by multiple-blade cartridges and disposable razors. For each type of replaceable blade, there is generally a disposable razor.