MAUMEE, Ohio (July 26)—The Eaton Aeroquip business of Eaton Corp. has signed a letter of intent to purchase privately held Frederick Duffield Pty. Ltd. in Australia for an undisclosed amount. Eaton expects to close the deal in September. The producer of metal hydraulic fittings and adaptors has operations in Sydney, Singapore, South Africa and New Zealand. Aeroquip´s primary customers for the products are in the industrial and mining sectors.