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Title: pH calibration unit model 77 (serial no. 7763) mounted in wo [Go to resource]
Description: pH calibration unit model 77 (serial no. 7763) mounted in wooden carrying box. E.I.L., Richmond, Surrey License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: pH calibration unit Source: Science Museum Creator: Electronic Instruments Ltd. Identifier: 1984-635/18 Go to resource More Like this...
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