Samuel and John Crosley

Gas engineers and gas meter manufacturers, of London
1841 Samuel and John Crosley invited William Crosley to join the business; he remained with them in London until 1845
1845 Samuel Crosley died; William Crosley left the business.
c.1849 William Parkinson took over the business of Samuel Crosley (deceased)
1862 Most of the station gas meters used by the London gas companies were made by Mr Parkinson or by Mr Crosley[1]