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[[Category:Specifications needed]] ''please add'' | [[Category:Specifications needed]] ''please add'' | ||
==Links== | |||
* [http://richardsears.wordpress.com/2011/06/18/tektronix-and-early-hewlett-packard/ Comparison of Tektronix 535, 535A, and HP 150A] with detailed pictures | |||
==Pictures== | ==Pictures== |