The Instruments Corporation 
4 North Central Avenue, 
Baltimore 2, Maryland. 
(Manufacturer of the Kelsh Plotter and Precision 
Meteorological and Hydrological Instruments). 
ITALIAN PARTICIPATION 
Officine Galileo, S.P.A. 
Via Carlo Bini 44, 
Florence, Italy. 
(Manufacturers of Santoni stereoscopic plotting 
instruments, and photogrammetric mappers). 
Ottico Meccanica Italiana e Rilevamenti Aerofotogrammetrici 
Via della Vasca Navale 81, 
Saromi, Roma, Italy. 
Branch address: Via Filippo Linati 3-5 
Parma, Italy. 
(Manufacturer of Nistri aerial and ground photogrammetric 
equipment and industrial instruments, and photogrammetric 
mappers). 
Jarrel-Ash Company 
165 Newbury Street, 
Boston, Mass., U.S.A. 
(Representative of Hilger & Watts, Ltd., of London, who 
manufacture surveying and industrial scientific instruments). 
E. R. Kramer & Company 
1835 K Street, N.W., 
Washington, 6, D.C., U.S.A. 
(Sales distributors of photographic products and processes 
for cartography and photogrammetry). 
The Photographic Survey Corporation, Ltd., 
1450 O’Connor Drive, 
Toronto, Ontario, Canada. 
(Member of the Hunting Group of Air Survey Companies 
engaged in aerial photography, photogrammetric mapping, 
magnetometer surveys, etc.) 
J. G. Saltzman, Inc., 
480 Lexington Avenue, 
New York, 17, N.Y., U.S.A. 
(Manufacturers of aerial photographic enlargers, map 
projectors, and photographic lighting equipment).