1 oct 1970 año - MEDLARS onLINE 
(MEDLINE) system
launched
Descripción:
 The National Library of Medicine (NLM) begins "providing access to Index Medicus content via the MEDLARS onLINE (MEDLINE) system."
Source:
National Library of Medicine. MEDLINE: History. National Library of Medicine. https://www.nlm.nih.gov/medline/medline_history.html. Last Reviewed Feb. 10, 2021. Accessed March 17, 2021. 
Añadido al timeline:
fecha:
1 oct 1970 año
Ahora mismo
 ~ 55 years ago