Tap changing voltage regulator for single phase three-wire system

Claim 1

A TAP CHANGING VOLTAGE REGULATOR FOR A SINGLE PHASE THREE-WIRE SYSTEM COMPRISING, IN COMBINATION, FIRST AND SECOND INPUT LINE TERMINALS ANDA NEUTRAL LINE TERMINAL, A SELECTOR SWITCH HAVING FIRST, SECOND, THIRD, FOURTH AND FIFTH CONTACTS, A SERIES TRANSFORMER HAVING FIRST AND SECOND SECONDARY COILS AND A PRIMARY CLIL, EACH OF SAID SECONDARY COILS HAVING AN INPUT CONDUCTOR AND AN OUTPUT TERMINAL, FIRST AND SECOND INPUT CONDUCTORS ASSOCIATED WITH SAID PRIMARY COIL, A REVERSING SWITCH HAVING FIRST, SECOND AND THIRD THERMINALS AND A MOVABLE CONTACT SELECTIVELY INTERCONNECTING SAID THIRD TERMINAL TO SAID FIRST OR SAID SECOND REVERSING SWITCH TERMINAL, CONDUCTORS INTERCONNECTING SAID FIRST INPUT LINE TERMINAL WITH SAID FIRST REVERSING SWITCH TERMINAL, SAID FIRST SELECTOR SWITCH CONTACT AND THE INPUT CONDCUTOR OF SAID FIRST SECONDARY COIL, CONDUCTORS INTERCONNECTING SAID SECOND INPUT LINE TERMINAL WITH SAID SECOND REVERSING SWITCH TERMINAL, SAID FIFTH SELECTOR SWITCH CONTACT AND THE INPUT CONDUCTOR OF SAID SECONDARY SECONDARY COIL, A THIRD OUTPUT TERMINAL, CONDUCTORS INTERCONNECTING SAID NEUTRAL LINE TERMINAL TO SAID SECOND AND FOURTH SELECTOR SWITCH CONTACTS AND SAID THIRD OUTPUT TERMINAL, A CONDUCTOR INTERCONNECTING SAID REVERSING SWITCH THIRD TERMINAL WITH SAID SELECTOR SWITCH THIRD CONTACT, SAID PRIMARY COIL FIRST INPUT CONDUCTOR BEING CONNECTED WITH SAID REVERSING SWITCH THIRD TERMINAL, SAID SELECTOR SWITCH INCLUDING MOVABLE CONTACT MEANS CONNECTED TO SAID PRIMARY COIL SECOND INPUT CONDCUTOR SELECTIVELY CONNECTING SAID PRIMARY COIL SECOND INPUT CONDUCTOR WITH AT LEAST ONE OF SAID FIRST, SECOND, FOURTH OR FIFTH SELECTOR SWITCH CONTACTS.