BS-00089 - Part 4 - 1990; Direct Acting Indicating Analogue Electrical Measuring Instruments and their Accessories Part 4 Specification for Special Requirements for Frequency Meters

BS-00089 - Part 4 - 1990; Direct Acting Indicating Analogue Electrical Measuring Instruments and their Accessories Part 4 Specification for Special Requirements for Frequency Meters - London BSI 1990 - 12p

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