76220839
Mar 7, 2001
Mar 18, 2003
ELECTRICAL TRANSFORMERS FOR INCREASING AND REDUCING THE VOLTAGE OF AN ELECTRICAL POWER SUPPLY TO ALLOW A PARTICULAR PIECE OF ELECTRICAL EQUIPMENT TO BE USED; COMMUTATORS FOR ALTERING THE DIRECTION OF AN ELECTRIC CURRENT; VOLTAGE STABILIZER FOR DIMINISHING THE VARIATION OF VOLTAGE AND ELECTRIC CURRENT
Electrical and Scientific Apparatus