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This four page brochure is concerned exclusively with the GEC Z5670 range of lanterns. It is undated but the
extremely similar GEC Z5673 catalogue is dated July 1964, so it's assumed this catalogue dates from
the same period.
Note that the section regarding optical systems appears to be incomplete as only one option is stated. This appears to be
an omission in the original catalogue and not mistake of my making.

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