Index of /pdf/tektronix/44xx/brochures
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   DIR /pdf/tektronix/44xx
       4300_Series_1988_Catalog.pdf
       4400_Series_1986_Catalog.pdf
       4400_Series_1987_Catalog.pdf
       4404-Flyer.pdf
       85-8-4405-Flyer.pdf
       85-8-4406-Flyer.pdf