DUO TEC 33 HE - 47-075-24. DUO TEC 33 HE A (AFTER SERIAL NO.BTH1112 ISSUE 9) - 47-075-37. DUO TEC 33 HE A (BEFORE SERIAL NO.BTH1112 ISSUE 8) - 47-075-37 BEFORE. DUO TEC 28 HE - 47-075-25. DUO TEC 28 HE A (AFTER SERIAL NO.CAC0929 ISSUE 9) - 47-075-36.
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