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- Helfrick, Albert D
Helfrick, Albert D (Nombre personal)
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Work cat.: (CoBo-ECI)7324: Helfrick, Albert D., Modern electronic instrumentation and measurements techniques/ , c1990.
AK. 45 No. 205 - 59, Autopista Norte.
PBX: +60(1) 668 3600 - Bogotá.