active 1914-1925, optical instrument makers, Dublin, Ireland & St Albans, Herts., England Sir Howard Grubb and Sons Limited
active 1925-1940/50s, optical instrument maker (telescopes etc.), Newcastle-upon-Tyne, England Sir Howard Grubb, Parsons and Company
active 1940/50s-1988, optical instrument maker (telescopes etc.), Newcastle-upon-Tyne, England Sir Howard Grubb, Parsons & Company Limited
