1983:Letrina SA is founded and operates in Greece and abroad in the field of cargo inspections. Integrated Services in:
> Manufacturers of raw materials
> Numerous companies specializing in the marketing of energy resources
1987: Founded by K. Bertsatos & Sons SA (Bertsons) based in Athens and is active in the field of petroleum improvers.
1993:Letrina SA is accredited by the National Accreditation System (ESYD SA) to the European Standard ISO / IEC 17021, fully independent and with the permanent aim of improving and upgrading its services.