The Hayward Company 



50 Church Street 



New York 7, New York 



Hazleton Laboratories, Inc. 



Box 30 



Falls Church, Virginia 



Hellige, Inc. 



877 Steward Avenue 



Garden City, New York 



ET. H. Herron, Jr. 

 (free lance writer) 

 F. O. Box 57 

 Fanwood, New Jersey 



Hoffman Electronics Corporation 

 Military Products Division 

 3740 South Grand Avenue 

 Los Angeles 7, California 



Hogan Faximile Corporation 

 635 Greenwich Street 

 New York, New York 



Hormon Associates 

 941 Rollins Avenue 

 Rockville, Maryland 



HRB-Singer, Inc. 



Science Park 



P. O. Box 60 



State College, Pennsylvania 



Hughes Aircraft Company 

 P. O. Box 2097 

 Fullerton, California 



Hughes Aircraft Company 



Communications Division 



P. O. Box 90902 



Airport Station, Bldg. 110, Mail 



Station 100 

 Los Angeles 9, California 

 Attn: C. McLoon 



Hughes Aircraft Company 

 1612 K Street NW 

 Washington, D. C. 



Humble Oil & Refining Company 

 Geophysical Research Section 

 Box 2180 

 Houston 1 , Texas 



Humble Oil & Refining Company 

 Marine Division 

 P. O. Box I5I2 

 Houston 1, Texas 

 Attn: J. D. Rogers 



Hyaline Plastics Corporation 

 1019 North Capitol Avenue 

 P. O. Box 523 

 Indianapolis 6, Indiana 



Hycon Mctnufactur ing Company 

 1030 S. Arroyo Parkway 

 Pasadena, California 



Hycon Manufacturing Company 

 700 Royal Oaks Drive 

 Monrovia, California 

 Attn: R. A. Ballweg, Jr. 



Hydronautics, Inc. 

 200 Monroe Street 

 Rockville, Maryland 



Hydro-Space Technology, Inc. 

 Clinton Road and Route 46 

 West Caldwell, New Jersey 



Hytech Corporation 



G Street Pier 



San Diego 1, California 



Imperial Electronic Systems 

 8530 Roland Street 

 Buena Park, California 



Industrial Instruments, Inc. 

 89 Commerce Road 

 Cedar Grove, New Jersey 



International Business Machines 

 Communications Center 

 7220 Wisconsin Avenue 

 Bethesda, Maryland 

 Attn: B. Bernstein 



International Business Machines 

 Connmand Control Center 

 Kingston, New York 

 Attn: Engineering Library 



International Business Machines 

 Federal Systems Division 

 nil Connecticut Avenue NW 

 Washington 6, D. C. 



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