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Formulae for calculating intensities of lighthouse beams and beams from cognate projection apparatus..
STANDARD published on 17.2.1941
Designation standards: BS 942:1941
Note: WITHDRAWN
Publication date standards: 17.2.1941
SKU: NS-79197
Approximate weight : 300 g (0.66 lbs)
Country: British technical standard
Category: Technical standards BS
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