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'''1953-54''': As above but with 3 or 4 as suffix according to the year made. | '''1953-54''': As above but with 3 or 4 as suffix according to the year made. | ||
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'''1955-60''': From 1955 the patent number is no longer shown on the pipe. Examples for this period read: | '''1955-60''': From 1955 the patent number is no longer shown on the pipe. Examples for this period read: | ||
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[[Image:1955_60_root.gif]] | [[Image:1955_60_root.gif]] | ||
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