C. E. G. Bland
John H. Walton
Robert J. Flood
Standard Drain Pipe Company.
British Standards Institution.
O. C. Young
Young. O. C.
Adrian Oswald
Luitfrid Marfurt
Clay Products Association, Chicago.
Byron Sudbury
Clay Pipe Institute.
Harold E. Babbitt
Lonnie Lee Abernethy
Klaus Freckmann
Eric G. Ayto
Roger Harvey Price