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In this extract from a Briggs 2008 publication, the factory lists 'highlights'
from the 1960s. I have used this to date this brochure.

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NOTE: Easy-Spin starting and the 'Coffee Grinder' starter appeared
in 1961. Brigg's Sound Lab was operational in 1967. I feel that is a
good indicator of how seriously Briggs took 'noise' at that time.