0001047469-01-000563 SC 13G/A 3 20010214 DIAMETRICS MEDICAL INC 0000895380 3845 411663185 MN 1231 SC 13G/A 34 005-42757 1543933 2658 PATTON RD ROSEVILLE MN 55113 6516398035 2658 PATTON ROAD ROSEVILLE MN 55113 TCW GROUP INC 0000850401 6798 SC 13G/A 865 SOUTH FIGUEROA ST LOS ANGELES CA 90017 865 SOUTH FIGUEROA STREET LOS ANGELES CA 90017 SC 13G/A 1 0001.txt SCHEDULE 13G/A EX-99.A 2 0002.txt RELEVANT SUBSIDIARIES OF PARENT HOLDING COMPANY EX-99.B 3 0003.txt JOINT FILING AGREEMENT