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09-26-2008, 07:55 AM   #1
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Join Date: Sep 2007
Location: West Virginia
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Extender Curiosity

I came upon the M42 Helicoid below marked 'VARIABLE CLOSE-UP RING', a marking I had not seen before and which I cannot locate in my old PTX catalogs.
Annyone have any info on this? I would guess it is later than the 'Helicoid' nomenclature. They are identical otherwise. Just wonderin'............

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