Non Conventional Indexing and Filing Equipment -libraray equipment-libraray management

Use of mechanical devices for sorting information recorded on special kinds of cards like edge notched cards, optical coincidence cards  and aperture cards has become obsolete with increased  use of new computers. The coded cards can be sorted manually or mechanically. Manual systems employ  specially designed cards,  and some use very simple manupulative devices such as needles. There is a system based on optical coincidence in which the holes are punched in the body of the card, and not on the edges. Some non-conventional systems like Rapid Selector (or Filmorex) and apertue cards combine the filing and indexing operations usually utilising film copies of documents.