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            Building Centres have facilities to cast the waffle unit. It could also be cast at site. Have been used in several construction works.  
              
              
              
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             Developed by 
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             CBRI, Roorkee 
              
              
              
                                           
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             Working specification by BMTPC including manufacturing method 
              
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             CT 04 
              
              
              
              
              
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             National standard framed 
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             IS 10505:1983 
              
              
              
              
              
              
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