Vtg lot 3M Visual Products Division Photo Slide Holders With Sound Recording

Description

Vintage lot 3M Visual Products Division Photo Slide Holders With Sound Recording Capability.
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Purchased these at a local estate auction.  As I understand it,  these are photo slide holders that have a little record type device for recording sound as part of the slide holder.  They may have sound on them already as I purchased them empty in the slide holding tray as shown.  They are made by 3M Visual Products Division.  I do not have a way to test them, so buy at your own risk.  If they do have a recording on them already, I'm not sure if you can erase it and re-record or not.  They are a little dusty and will need to be wiped off.