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Engíneeríng Problems
 


 

ín
 

Ele
 

:tríc Elevated and Suburban Raílroadíng
 

Thc Multiple Unít Systcm
 

BY
 


 

FRANK J. SPRAGUE
 


 

A PAPER
 

\
 

DELP/ERED BEFORE THE
 


 

AHERICAN INSTTTUTE OF ELECTRICAL ENGĨNEERS
 


 

HAY 16, 189.