1. Universal Newsreels, Release 940, December 26, 1940
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2. C57.12.23-1992 - IEEE Standard for Transformers - Underground-Type, Self-Cooled, Single-Phase Distribution Transformers with Separable, Insulated, High-Voltage Connectors; High Voltage (24 940 GrdY/14 400 V and Below) and Low-Voltage (240/120 V, 167 kVA and Smaller)
Technology -- Technology (General) -- Industrial engineering. Management engineering
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