S 
  
Part of a vertical photography of the roof connecting stadium and athletic arena. 
  
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Polaroid picture of system points for better identification, 
Regions that could not be covered by vertical photography had to be fitted in with oblique 
photographs taken with the Veroplast, 
P 
  
Since it was impossible to keep the wooden floor and the gallows free from vibrations 
during the day, all works had to be done after usual working hours in night-shifts lasting 12 to 
15 hours, 
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