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Charles B. Johnson of Prescot, Lancashire
Charles B Johnson was born c.1822.
1841, age 15, he was an apprentice in the industry.
1851 Listed as a watchmaker employing 4 men and 2 apprentices.
1861: Listed as a watch hand maker, employing 3 men and 3 apprentices.
1871: 'Watch and watch material maker'
1881: 'Watchmaker - hands and balance weights', employing 5 men and 1 boy
1891: 'Watch & material maker'.
The above information is from census returns.
A number of examples of vernier calipers are in existence, marked C. B Johnson, Prescot.