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Title: Watson Holostigmat convertible lens [Go to resource]
Description: Watson Holostigmat convertible lens, c. 1920. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1920 Source: Science Museum Creator: Watson, Patrick Heron, Sir (maker) Identifier: 1969-228 Go to resource More Like this...
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