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Patent pending on new draw tubes ???

Chaz2b

By Chaz2b
in The Astro Lounge

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Chaz2b

Chaz2b

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Browsing through some refractors, I noticed that Visionking are selling a refractor with the added line “it  belongs to a new generation of draw tubes with patent pending”  all excited now, what could they have invented?

 

chaz2b

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