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A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead , often made of graphite , is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use.
A type of mechanical pencil has a rotating gear mechanism which rotates the lead slightly every time the lead is lifted off the paper, helping to maintain a consistent, sharp point. If a finer or broader line is needed, a separate mechanical pencil using a lead with a different diameter is required.
To match its own invention, the company also renamed to "Auto". [1] In the 1960s, Ohto also released the first water-based ballpoint pen, thus establishing a new category of pens: rollerball pens. [2] In 1974, the company realised that the word "Auto" was too closely associated with cars, and changed its name again to "Ohto". [1]
That same year Rotring launched its first drawing board, and the "Tikky" mechanical pencil was released in 1979. The "Art Pen", a fountain pen suitable for calligraphy , was launched in 1984. During the decade, Rotring set new subsidiaries in other European countries, while the "600" mechanical pencil was introduced in 1989.
Mechanical pencil sharpener; Fishing reel and other reels for cables, wires, ropes, etc. Starting Handle for older cars; Manually operated car window; The carpenter's brace is a compound crank. The crank set that drives a handcycle through its handles. Hand winches
In 1955, Scripto was the first to introduce what it called Fluidlead. This was a pencil that wrote like a pen using liquid graphite. Another company, Parker Pens, had developed a similar product called Liquid Lead that was a few months behind Scripto in production. To avoid a costly patent fight the two companies agreed to share their formulas ...
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