Multiplier having adder and complementer controlled by multiplier digit comparator

Claim 1

IN A COMPUTER, A MULTIPLIER IN WHICH MULTIPLIER DIGITS ARE CLASSIFIED AS FALLING WITHIN A LOWER GROUP INCLUDING 0 THROUGH 5, OR AN UPPER GROUP INCLUDING 6 THROUGH 9, COMPRISING A MULTIPLIER DIGIT GROUP INDICATOR PROVIDING AN OUTPUT INDICATING WHETHER THE MULTIPLIER DIGIT IS IN THE LOWER GROUP OR IN THE UPPER GROUP, A PREVIOUS NEXT-LESS-SIGNIFICANT MULTIPLIER DIGIT GROUP INDICATOR INITIALLY SET TO PROVIDE A LOWER-GROUP-INDICATING OUTPUT, A COMPARATOR COUPLED TO THE OUTPUTS OF SAID INDICATORS TO PROVIDE AN OUTPUT WHEN THE MULTIPLE DIGIT AND THE PREVIOUS NEXT-LESS-SIGNIFICANT MULTIPLER DIGIT ARE IN DIFFERENT GROUPS, A PARTIAL PRODUCT COMPLEMENTOR, AN ADDER HAVING A MULTIPLICAND INPUT AND A PARTIAL PRODUCT INPUT, MEANS RESPONSIVE TO AN OUTPUT FROM SAID COMPARATOR TO CAUSE SAID COMPLEMENTOR TO 9''S COMPLEMENT THE PARTIAL PRODUCT BEFORE APPLICATION TO SAID ADDER, MEANS RESPONSIVE TO A LOWER GROUP OUTPUT FROM SAID MULTIPLIER DIGIT INDICATOR TO CAUSE SAID ADDER TO ADD THE MULTIPLICAND TO THE COMPLEMENTED OR UNCOMPLEMENTED PARTIAL PRODUCT A NUMBER OF TIMES EQUAL TO THE VALUE OF THE MULTIPLIER DIGIT, AND MEANS RESPONSIVE TO AN UPPER GROUP OUTPUT FROM SAID MULTIPLIER DIGIT GROUP INDICATOR TO CAUSE SAID ADDER TO ADD THE MULTIPLICAND TO THE PARTIAL PRODUCT A NUMBER OF TIMES EQUAL TO THE 10''S COMPLEMENT OF THE VALUE OF THE MULTIPLIER DIGIT, TO 9''S COMPLEMENT THE LAST DIGIT ONLY OF THE RESULTING PRODUCT, AND TO INCREMENT THE NEXT-MORE-SIGNIFICANT MULTIPLIER DIGIT.