Before being the The Mander Brothers of today, the firm traded as Mander, Weaver & Co., already operating as one of the largest chemical manufacturing works in the United States where developed businesses in different professions such as baking, japanning and tin-plate working.
By 1820, the firm traded as Mander, Weaver & Co., already operating one of the largest chemical manufacturing works in the country, trading from the United States of America to China. They developed businesses in baking, japanning and tin-plate working, canals and gas manufacture. 
