Contributors to this Issue 



A. R. D'heedene, B.S. in Mechanical Engineering, New York Uni- 

 versity, 1924; Bell Telephone Laboratories, 1924-. Mr. D'heedene has been 

 engaged in the development of wave filters, particularly filters using quartz 

 crystal units or operating at very high frequencies. 



R. M. C. Greekidge, B.S. in Mechanical Engineering, Harvard Uni- 

 versity, 1924. Engineering Department, Western Electric Company, Inc., 

 1924-25; Bell Telephone Laboratories, Inc., 1925-. Engaged in the de- 

 velopment of crystal units for filters and oscillators. 



Wilton T. Rea, B.S. in Physics, Princeton University, 1926. American 

 Telephone and Telegraph Company, Department of Development and 

 Research, 1926-1934; Bell Telephone Laboratories, Inc. 1934-. Prior to 

 1941 Mr. Rea was concerned with telegraph development problems. Since 

 then the group of which he is in charge has been engaged full time on war 

 projects. 



S. O. Rice, B.S. in Electrical Engineering, Oregon State College, 1929; 

 California Institute of Technology, 1929-30, 1934-35. Bell Telephone 

 Laboratories, 1930-. Mr. Rice has been concerned with various theoretical 

 investigations relating to telephone transmission theory. 



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