2012BS ISO 8578:2012 Microscopes. Marking of objectives and eyepieces
1997BS 7012-15:1997 Light microscopes - Marking of objectives and eyepieces
BS ISO 8578:2012 Microscopes. Marking of objectives and eyepieces has been changed from BS 7012-15:1997 Light microscopes - Marking of objectives and eyepieces.