(19)

(11)

EP 0 267 230 A1

(12)

(43) Date of publication: 18.05.1988 Bulletin 1988/20 (21) Application number: 87902986.0 (22) Date of filing: 27.03.1987

(51) International Patent Classification (IPC):  E02B 3/ 16( . ) E04B 1/ 68( . ) (86) International application number: PCT/US1987/000695 (87) International publication number: WO 1987/005957 (08.10.1987 Gazette 1987/22)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 31.03.1986 US 19860846371 (71) Applicant: BECHTEL INVESTMENTS, INC. San Francisco, CA 94119 (US)	(72) Inventors: ANDERSON, Joseph Atherton, CA 94025 (US) BALDI, Barney, T. Eldorado Hills, CA 95630 (US) ENGSTROM, John, M. Walnut Creek, CA 94598 (US)