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pH meter, 1950-1970.
Direct-reading ammeter, 1900.
Avo Smethurst Exposure Meter, c 1930s.
Safety matches and Avo Smethurst exposure meter, c 1930s.
Siemens and Halske watt-hour meter.
Ohmmeter 'Megger' tester, c 1950s.
Nicholson molecular models with instruction leaflets, 1981.
Open University pH meter and probe, 1990-1996.
Open University pH meter and probe, 1990-1996.
Model of J Seaward's direct acting paddle-engines.
Camera and hood for photographing 'phone-call meters, c 1965.
Camera and hood for photographing 'phone-call meters, c 1965.
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