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PL62558B1
(de)
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GB1005941A
(en)
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Improvements relating to testing devices for testing protective switches
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US4081854A
(en)
|
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Meter protection circuit
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US3408564A
(en)
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Electrical apparatus including a pair of replica impedances for measuring distances along a loaded electrical line
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US3376502A
(en)
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Apparatus having standard impedance calibration means for testing the impedance of an electrical ground and including polarity reversing switch means
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US2555306A
(en)
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Wiring analyzer
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PL62978B3
(de)
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US2648820A
(en)
|
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Direct-reading low range ohmmeter
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PL92308B1
(de)
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DE519825C
(de)
|
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Elektrische Anzeigevorrichtung fuer Windungsschluesse oder Widerstandsaenderungen
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PL68208B1
(de)
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SU603911A1
(ru)
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Контрольно-электроизмерительный прибор
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PL67058B1
(de)
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PL56823B1
(de)
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SU94883A1
(ru)
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Компенсационное устройство дл измерени сопротивлени заземлени опор линий электропередач с заземл ющим тросом
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GB1003444A
(en)
|
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Improvements relating to the measurement of electrical resistance
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US2337962A
(en)
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Method and apparatus for determining resistance of ground connections
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DE669331C
(de)
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Pruefgeraet fuer elektrische Anlagen
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GB691633A
(en)
|
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Improvements in or relating to the measurement of resistance
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US2458805A
(en)
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Apparatus for measuring electrical resistance
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GB771537A
(en)
|
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Improvements relating to electrical impedance testing instruments
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PL94166B1
(de)
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PL51965B1
(de)
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PL58936B1
(de)
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PL57104B1
(de)
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