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2. Marel FB9140, Marel Inf. Hofdabakka 9, PO Box 8394, 128 Reykjavik, Iceland.
3. The use of Digital Electronics in length measurement of fish;Taylor;Torry Document,1974
4. Fischtechnik Fredelsloh GmbH, D-3413 Moringen 1, W Germany.
5. Application for optical sensor to fish sorting;Tayama;Reito (Tokyo) (Refrigeration),1982