0000032878-98-000020 424B1 1 19980512 NASD ENERGY CONVERSION DEVICES INC 0000032878 3690 381749884 DE 0630 424B1 33 333-50749 98616573 1675 W MAPLE RD TROY MI 48084 8102801900 ENERGY CONVERSION LABORATORIES INC 19710603 424B1 1 000003287898000020-001-seq1-424b1.txt PROSPECTUS