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Method and system for configuring error correction data base for measuring gps positioning coordinate and method and system for correcting measurement error of gps positioning coordinate
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Optical device equipped with rotating lenticular lens in which eye piece in eliminated
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Variable length data transmission system by means of convoluting code
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System for reading phase difference in decca receiver
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Locating system of variable angle intersecting type in hydrographic ch art
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Method to prevent improper operation cause by noises etc. distance mea suring machine using several frequencies
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Method and system to measure the distance of signals generated for the limination of phase lag inside the unit
