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Link to original content: http://en.wiktionary.org/wiki/Wratten_number
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Wratten number

From Wiktionary, the free dictionary

English

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English Wikipedia has an article on:
Wikipedia

Etymology

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Named after Frederick Wratten, British inventor who founded the first photography company.

Noun

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Wratten number (plural Wratten numbers)

  1. Any of the arbitrary alphanumeric codes in a system for labelling optical filters, usually for photographic use.
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