EXHIBIT 4.2 SECOND SUPPLEMENTAL INDENTURE This Second Supplemental Indenture (this "Supplemental Indenture"), dated as of March 26, 2007, is entered into by and among Altra Industrial Motion, Inc. (the "Company"), the Guarantors signatory hereto (the...Second Supplemental Indenture • March 26th, 2007 • Altra Industrial Motion, Inc. • General industrial machinery & equipment, nec • New York
EXHIBIT 4.1 FOURTH SUPPLEMENTAL INDENTURE This Fourth Supplemental Indenture (this "SUPPLEMENTAL Indenture"), dated as of March 21, 2007, is entered into by and among Altra Industrial Motion, Inc., a Delaware corporation (the "COMPANY"), the...Fourth Supplemental Indenture • March 26th, 2007 • Altra Industrial Motion, Inc. • General industrial machinery & equipment, nec • New York
