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Photo: Lothar Keselhut showing marked optical cards to children
physical object
2016.3.96
Description
Black and white photo of Lothar Keselhut showing optical mark cards to children possibly on a field trip
Related Donors
Angela Tran
Jim Marshall
![[BLANK]](https://computermuseum-dev.uwaterloo.ca/media/computermuseum/images/1/0/44677_ca_object_representations_media_1079_large.jpg)