Tektronix 551 Dual Beam Instruction Manual page 91

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CAL. C.F.
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CONCENTRIC W ITH 2 > -2 / 7 - 6 2 J R
SQUARE-WAVE C A LIB R A TO R
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S E E PAR TS L IS T F O R E A R L IE R
V A L U E S AND S /N CHANGES OF
PARTS M A R K E D W IT H R E D
CALIBRATOR
AAZ
T IN T BLOCKS