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5 - <br /> I <br /> � I <br /> i <br /> ,e <br /> vacuum guage . <br /> i f <br /> El <br /> t0 <br /> to sample evacuvation ` <br /> syringe <br /> pump <br /> ball bearing <br /> valve <br /> to sampling <br /> rod <br /> FIGURE 2. Brass fitting connects evacuation pump, vacuum guage, <br /> and sampling syringe to hollow sample rod. <br /> M <br /> n <br /> i <br /> 4 <br /> I q � <br /> I — � <br />