Exhibit 21 Mallinckrodt Inc. 1997 LEGAL ENTITY MASTER FILE LEGAL NAME JURISDICTION - ---------- ------------ Alton Dean Medical, Inc. UTAH Carnforth Limited BERMUDA Coromandel Fertilisers Ltd. INDIA Creative Solutions Industria e Comercio Ltda. BRAZIL Dittander Limited IRELAND Dritte CORSA Verwaltungsgesellschaft mbH GERMANY D.M. Graham Laboratories, Inc. NEW YORK HemoCue AB SWEDEN IMC Exploration Company MARYLAND IMCERA Ltd. UNITED KINGDOM LF International, FSC Inc. BARBADOS Liebel-Flarsheim Company DELAWARE Mallinckrodt Athlone Holdings, Inc. DELAWARE Mallinckrodt Baker B.V. NETHERLANDS Mallinckrodt Baker, Inc. NEW JERSEY Mallinckrodt Baker S.A. de C.V. MEXICO Mallinckrodt Chemical Australia Pty. Limited AUSTRALIA Mallinckrodt Chemical Belgium B.V.B.A. BELGIUM Mallinckrodt Chemical Canada Inc. CANADA Mallinckrodt Chemical GmbH GERMANY Mallinckrodt Chemical Holdings GmbH GERMANY Mallinckrodt Chemical Holdings (U.K.) Ltd. UNITED KINGDOM Mallinckrodt Chemical, Inc. DELAWARE Mallinckrodt Chemical Limited UNITED KINGDOM Mallinckrodt DAR Srl ITALY Mallinckrodt Europe B.V. NETHERLANDS Mallinckrodt FSC Inc. BARBADOS Mallinckrodt Holdings B.V. NETHERLANDS Mallinckrodt Iberica S.A. SPAIN Mallinckrodt Inc. DELAWARE Mallinckrodt Inc. NEW YORK Mallinckrodt International Corporation MISSOURI Mallinckrodt Medical AG SWITZERLAND Mallinckrodt Medical Argentina Limited UNITED KINGDOM Mallinckrodt Medical Asia Pacific Pte. Ltd. SINGAPORE Mallinckrodt Medical B.V. HOLLAND Mallinckrodt Medical Caribe, Inc. DELAWARE Mallinckrodt Medical Co., Ltd. JAPAN Mallinckrodt Medical do Brasil, Ltda. BRAZIL Mallinckrodt Medical GmbH GERMANY Mallinckrodt Medical Holdings GmbH GERMANY Mallinckrodt Medical Holdings Ireland IRELAND Mallinckrodt Medical Holdings (U.K.) Limited UNITED KINGDOM Mallinckrodt Medical (U.K.) Ltd. UNITED KINGDOM Mallinckrodt Medical Imaging - Ireland IRELAND Mallinckrodt Medical, Inc. CANADA Mallinckrodt Medical, Inc. DELAWARE Mallinckrodt Medical International Holdings IRELAND Mallinckrodt Medical Isle of Man ISLE OF MAN Mallinckrodt Medical Lda. PORTUGAL Mallinckrodt Medical IRELAND Mallinckrodt Medical Pty. Ltd. AUSTRALIA Mallinckrodt Medical S.A. FRANCE Mallinckrodt Medical S.A. SPAIN Mallinckrodt Medical S.A. de C.V. MEXICO Mallinckrodt Medical S.A./N.V. BELGIUM Mallinckrodt Medical Srl ITALY Mallinckrodt Medical (U.K.) Limited UNITED KINGDOM Mallinckrodt Medical Vertriebs-GmbH AUSTRIA Mallinckrodt Medical PMC NEVADA Mallinckrodt Polska Sp.zo.o POLAND Mallinckrodt Radiopharma GmbH GERMANY Mallinckrodt Services B.V. NETHERLANDS Mallinckrodt TMH NEVADA Mallinckrodt Veterinary, Inc. DELAWARE Mallinckrodt Veterinary International, Inc. DELAWARE MMHC, Inc. DELAWARE MMI, Inc. DELAWARE MMJ S.A. de C.V. MEXICO Molecular Biosystems, Inc. DELAWARE MSCH Company DELAWARE National Catheter Corporation NEW YORK Paracet Laboratories, Inc. DELAWARE Pharm Tech Packaging Corporation NEW YORK Sterlington Land Co. DELAWARE Synbiotics Corporation CALIFORNIA