0000950128-99-000091 SC 13G/A 1 19990202 DIAMETRICS MEDICAL INC 0000895380 3845 411663185 MN 1231 SC 13G/A 34 005-42757 99519007 2658 PATTON RD ROSEVILLE MN 55113 6126398035 2658 PATTON ROAD ROSEVILLE MN 55113 STATE OF WISCONSIN INVESTMENT BOARD 0000854157 0000 396006423 WI 0630 SC 13G/A 121 EAST WILSON STREET MADISON WI 53707 6082662381 P.O. BOX 7842 121 EAST WILSON STREET MADISON WI 53707 SC 13G/A 1 000095012899000091-001-seq1-sc-13g-a.txt DIAMETRICS MEDICAL, INC. AMENDMENT NO. 4