3706001 Transformers and auto-transformers, up to 1 kVA 3706002 Transformers and auto-transformers, over 1 kVA 3706003 Transformers and auto-transformers up to 1 mVA 3706004 Transformers and auto-transformers over 1 mVA 3706005 Transformers, dry 3706006 Transformers and auto-transformers, water-cooled 3706007 Transformers and auto-transformers, oil immersed 3706008 Transformers and auto-transformers, air-cooled 3706009 Transformers, high and medium frequency 3706010 Transformers, microwave 3706011 Transformers, voltage regulating 3706012 Transformers, phase converting (Scott, Leblanc and Court) 3706013 Transformers, constant current 3706014 Transformers, constant voltage 3706016 Transformers and auto-transformers, variable ratio 3706018 Transformers, booster 3706019 Transformers, earthing 3706020 Transformers, isolation 3706023 Transformers, neon 3706024 Transformers, rectifier 3706025 Transformers, balancing 3706026 Transformers, toroidal core 3706027 Transformers, magnetic amplifier 3706028 Transformers, ferromagnetic resonance 3706032 Transformers, instrument 3706033 Transformers, current 3706034 Transformers, driver 3706035 Transformers, Hall effect 3706036 Transformers, flameproof and explosion proof 3706037 Transformers, resin cast or encapsulated 3706038 Transformers, miniature and subminiature 3706039 Transformers, distribution 3706042 Transformers, planar 3706045 Transformers, traction 3706046 Transformers, welding 3706047 Transformers, audio frequency/audio 3706048 Transformers, radio frequency (RF) 3706049 Transformers, television 3706050 Transformers, X-ray 3706051 Transformers, diode split 3706052 Transformers, inverter circuit 3706053 Transformers, ferrite
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