Image of the old fashioned Whitney Rack

I have googled immensely but cannot find an image of the older days Whitney rack used in non-computerized system of reservations before computers made life system

I would appreciate if someone could help me with this and post a link to the image. perhaps you have a text book from which this image may be scanned and uploaded?

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Whitny Rack Example Picture

Here are two sample Images of the old Whitney Rack Systems used in the hotel Front desk department to track guest movements.