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[[File:Auto-Advance-Only pencils.JPG|200px|right|Examples of auto-advance pencils that are not provided with a push button mechanism. Top to bottom: a Paper Mate Advancer, a Fila Temagraph Automatic, and a M&G Comrade]]'''Auto-advance''' or '''auto-feed''' [[mechanical pencil|mechanical pencils]] don't need any action to advance the lead because of their particular mechanism: a spring-loaded sliding sleeve (usually a plastic cone) pushes out more lead every time it is pressed and released from the paper.
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[[File:Rotring pens.jpg|300px|thumb|right|Rotring 600 and 500 pens]]
In order to work, it is required to write with a very little amount of lead coming outside the tip, and practically to drag the lead sleeve on the paper.
 
Most of the time these pencils are also provided with a push button mechanism, and can be used in the classical way.
 
  
{{TWFAFULL|Auto-Advance_mechanism}}
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The Rotring 600 was first released in 1989.<ref name="rheritage">[https://www.rotring.com/uk/heritage 1989 Entry] Rotring Heritage</ref> Its design can be traced back to the preceding Rotring 500 series, which debut in 1985 with burgundy plastic barrels and metal knurled grips. The Rotring 500 is contemporary with the almost identical Rapidomatic series by Koh-I-Noor USA, which was bought over by Rotring in 1985. The Rapidomatic series of 'fine lead mechanical pencils' was a refinement from Koh-I-Noor's Select-O-Matic II 2.0mm leadholder, which is itself a refinement of the company's Select-O-Matic 5617 (1955–1984), which featured a hexagonal metal body, knurled grip and patented lead hardness indicator in the push button. The first version of the Rotring 500 did not have a 'red ring' around its lead indicator knob.
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Rotring describes the 600 as their "entry into the upscale writing instrument market"<ref name="rheritage" />, "designed with a hexagonal barrel to prevent it from rolling on the architects drawing table. It is machined out of one piece of brass on a lathe, providing it with ample weight to ensure that the architect need not apply extra pressure when creating"<ref name="rheritage" />.
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The Rotring 600 was originally made in Germany before production moved to Japan.
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==Red Ring==
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A late 1988 catalog lists the first version of Rotring 600 only in 0.5mm lead diameter. It was offered in silver or black color and featured a 'thin' red ring around the lead indicator knob. The familiar 'thick' red ring was only introduced in 1990.
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{{TWFAFULL|Rotring 600}}

Latest revision as of 17:07, 2 March 2020

Rotring 600 and 500 pens

The Rotring 600 was first released in 1989.[1] Its design can be traced back to the preceding Rotring 500 series, which debut in 1985 with burgundy plastic barrels and metal knurled grips. The Rotring 500 is contemporary with the almost identical Rapidomatic series by Koh-I-Noor USA, which was bought over by Rotring in 1985. The Rapidomatic series of 'fine lead mechanical pencils' was a refinement from Koh-I-Noor's Select-O-Matic II 2.0mm leadholder, which is itself a refinement of the company's Select-O-Matic 5617 (1955–1984), which featured a hexagonal metal body, knurled grip and patented lead hardness indicator in the push button. The first version of the Rotring 500 did not have a 'red ring' around its lead indicator knob.

Rotring describes the 600 as their "entry into the upscale writing instrument market"[1], "designed with a hexagonal barrel to prevent it from rolling on the architects drawing table. It is machined out of one piece of brass on a lathe, providing it with ample weight to ensure that the architect need not apply extra pressure when creating"[1].

The Rotring 600 was originally made in Germany before production moved to Japan.

Red Ring[edit]

A late 1988 catalog lists the first version of Rotring 600 only in 0.5mm lead diameter. It was offered in silver or black color and featured a 'thin' red ring around the lead indicator knob. The familiar 'thick' red ring was only introduced in 1990.

(Full article...)

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  1. 1.0 1.1 1.2 1989 Entry Rotring Heritage