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t <br />DOWNHOLE <br />DELAY <br />PERIODS <br />4 <br />IA <br />64 HOLE PATTERN <br />0.6 P. F. <br />20 FT. x 30 FT. <br />m8200 ms250 ms300 ms350 ms400 ms450 ms500 ms600 <br />roiiuv i iuc <br />ms 42 SURFACE DELAYS <br />2 HOLES /DELAY PERIOD <br />ODELAY TIMING AT EACH HOLE <br />200 <br />FIGURE 3.4 -4 TYPICAL DELAY SCHEME <br />3 -35 <br />REVISED FFB 1 -5'87 <br />