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Title: Lawrence Flashrule slide rule for photographic use, copyrigh [Go to resource]
Description: Lawrence Flashrule slide rule for photographic use, copyright 1946 by Lawrence Engineering Service, made in Peru, Indiana, in original paper holder License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: slide rule (photography) Temporal: 1946-1956 Source: Science Museum Creator: Lawrence Engineering Service Identifier: 1990-618 Go to resource More Like this...
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