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Date: |
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Description: | Papers of Mortimer A. Codd, electrical engineer 1909-1937: Patent Specification for "Improvements in or relating to Electric Supply Systems for Lighting and other purposes." No 29,329 of 1909 | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Source: | Science Museum | Identifier: | 03/02/2009 | Go to resource |
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