A document signed by the supplier of an active substance which declares that it supplies the active substance to the recipient. The letter can be specific for a single product or general for all the recipient's relevant products
Health and Safety Executive (HSE), Glossary of Terms on Biocides and Pesticides, HSE, Merseyside, England, UK 2013. http: //www.hse.gov.uk/biocides/glossary.htm, (Hlth and Sfty - Brit) {701}