by WAFER; JOHN A, ELMS; ROBERT T, SALETTA; GARY F, ENGEL; JOSEPH C
Year of Publication 25.05.1982

by A. WAFER,JOHN, J. MATSKO,JOSEPH, C. ENGEL,JOSEPH, J. MERCIER,BERNARD
Year of Publication 18.02.1982

by A. WAFER,JOHN, T. WILSON,JOHN, C. ENGEL,JOSEPH, T. ELMS,ROBERT
Year of Publication 28.01.1982

by STEPHENSON, WILLIAM I., JR, WAFER, JOHN A, HILL, ROBERT H
Year of Publication 12.01.1982

by JOSEPH C. ENGEL, JOHN A. WAFER, ROBERT T. ELMS ET GARY F. SALETTA
Year of Publication 16.10.1981

by JOSEPH J. MATSKO, JOHN A. WAFER, JOSEPH C. ENGEL ET BERNARD J. MERCIER
Year of Publication 16.10.1981

by ENGEL JOSEPH C, ELMS ROBERT T, WAFER JOHN A, WILSON JOHN T
Year of Publication 14.04.1981

by SALETTA GARY F, ENGEL JOSEPH C, ELMS ROBERT T, WAFER JOHN A
Year of Publication 14.04.1981

by MERCIER BERNARD J, ENGEL JOSEPH C, WAFER JOHN A, MATSKO JOSEPH J
Year of Publication 14.04.1981

by WAFER, JOHN A, NELSON, HUGH A, KOREN, PAUL P, MAIER, ALFRED E, SALEMI, NICHOLAS A
Year of Publication 16.12.1980

by WAFER, JOHN A, NELSON, HUGH A, KOREN, PAUL P, MAIER, ALFRED E, SALEMI, NICHOLAS A
Year of Publication 11.11.1980

by WAFER, JOHN A, STEPHENSON, WILLIAM I JR, HILL, ROBERT H
Year of Publication 02.09.1980

by STEPHENSON WILLIAM I. JR, HILL ROBERT H, WAFER JOHN A
Year of Publication 15.10.1979

by BRATKOWSKI, WALTER V, WAFER, JOHN A, BHATE, SURESH K, LANG, WALTER W
Year of Publication 09.01.1979

by WAFER, JOHN A., BEAVER, PA., US, YAMAT, MIGUEL B., GREENDALE, WIS., US
Year of Publication 04.08.1988

by BRATKOWSKI; WALTER V, BHATE; SURESH K, WAFER; JOHN A, LANG; WALTER W
Year of Publication 22.03.1977

by SLADE, PAUL G., PITTSBURGH, PA., US, WAFER, JOHN A., MONROEVILLE, PA., US
Year of Publication 26.02.1987

by WAFER, JOHN A., BEAVER, PA., US, BEATTY JUN., WILLIAM ELLSWORTH, BEAVER FALLS, PA., US
Year of Publication 02.11.1989

by WAFER, JOHN A., BEAVER, PA., US, ENGEL, JOSEPH C., MONROEVILLE, PA., US, MERCIER, BERNARD J., PITTSBURGH, PA., US, MATSKO, JOSEPH J., BEAVER, PA., US
Year of Publication 21.04.1994

by WAFER, JOHN A., BEAVER, PA., US, MAIER, ALFRED E., BEAVER FALLS, PA., US, RICCI, LOUIS N
Year of Publication 03.11.1988