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It looks like they're belts for an IBM "Executary" dictating machine.
http://www-03.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV4019.html

You have a reference to these things on your own web site:
http://www.richardhess.com/notes/formats/magnetic-media/magnetic-dictation-belts/

John Ross

At  5/2/2007 02:18 PM, you wrote:
>A person contacted me today with an approximately 5x8 inch magnetic 
>sheet with the IBM logo on it and two holes punched in that edge. It 
>appears to be magnetic material. We have no idea if it's audio (I 
>haven't seen it before) and I'm suspicious that it MIGHT be a word 
>processing format. It dates from the late 1960s and was apparently 
>part of some U.S. Navy documentation.
>
>A photo of it is posted at: http://www.donmarquis.org/ibm.pdf
>
>There are ten of these sheets in the collection.