0000950131-99-001948 10-K405 5 19981231 19990331 GSI GROUP INC 0001050925 3523 370856587 DE 1231 10-K405 34 333-43089 99580592 1004 EAST ILLINOIS ST ASSUMPTION IL 62510 2172264421 1004 EAST ILLINOIS ST ASSUMPTION IL 62510 10-K405 1 000095013199001948-001-seq1-10-k405.txt FORM 10-K405 EX-10.1 2 000095013199001948-002-seq2-ex-10-1.txt FOURTH AMENDED AND RESTATED LOAN EX-12.1 3 000095013199001948-003-seq3-ex-12-1.txt COMPUTATION OF RATIO OF EARNINGS EX-21.1 4 000095013199001948-004-seq4-ex-21-1.txt LIST OF SUBSIDIARIES EX-27 5 000095013199001948-005-seq5-ex-27.txt FINANCIAL DATA SCHEDULE