Medical and Scientific Organizations
You have found the way to Organizations on Medical and Scientific:
Antique Telescope Society - International organization of colleagues interested in antique astronomical telescopes, books, binoculars and related materials.
Canadian Historical Microscopical Society - Mission is to bring together private (and institutional) collectors of antique (and modern) optical instruments with particular emphasis on microscopes.
Scientific Instrument Society - Bringing together people with a specialist interest in scientific instruments, ranging from precious antiques to electronic devices only recently out of production. Help build the largest human-edited directory on the web.