Lot numbers for Part Numbers: HC405A (lot #s: 020930 to 060410) , HC405SL (lot #s: 040225 to 040325), HC405U (lot #s: 030922 to 060217), HCHC406A (lot #s: 050830 to 060123), HC406SL (lot #s: 051021 to 051220), HC407A (lot #s: 031124 to 060207), HC407SL (lot #s: 040921 to 060202) & HC407U (lot #s: 040407 to 060113)