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A visible file, sometimes just called a kardex, after a prominent purveyor, is a filing system for overlapping cards fixed in shallow drawers.
The best-known version was commercialized by Kardex.
The
The Library Bureau
The Library Bureau was a business founded by Melville Dewey in 1876 to provide supplies and equipment to libraries. The Library Bureau quickly became a one-stop vendor for supplies and equipment a library might need. By 1900, its lengthy, well ill ...
company commercialized the very similar L. B. Speedac.''The Magazine of Business'' 47:294 (1925)
Another brand was the Index Visible System.
Notes