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UNSPECIFIED (2003) FIG. Journal of School of Engineering Sciences, 9 (4).
UNSPECIFIED (2003) Illustration A TELEPHONE EXCHANGE. Journal of School of Engineering Sciences, 6 (2).
UNSPECIFIED (2003) FIG. Journal of School of Engineering Sciences, 9 (4).
UNSPECIFIED (2003) Illustration A TELEPHONE EXCHANGE. Journal of School of Engineering Sciences, 6 (2).