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23013, 23012, 23014, sliding rheostat
23018 resistance coil
23020 Resistance Law Experimenter
23021 demonstration resistance box
23022 Teaching Resistance Box
23023 simple resistance box
23030 demonstration circuit experiment board
23032 student circuit experiment board
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Primary mathematics
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Ningbo Zhongqi Education Equipment Co., Ltd.
Tel：0574-6206 1266
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浙江七米
