of Union St, Oldham
1830 Business established (see picture of the Gas Meter Co's works), presumably by Thomas West (1802-1845).
1845 Presumably this business was taken over by his elder son, Robert, after his father's death - Robert West
Subsequently the business may have become West Brothers and Co, when Robert's brother, John reached his maturity.
Then Henry Gregson became a partner and the firm became West and Gregson
1851 West and Gregson exhibited model meter for gas works at 1851 Exhibition.
c.1852 At some point Robert left the business
c.1863 After the death of Mr Gregson and Mr. John West, Mrs. West continued the business for herself and children.
1865 See John West and Co