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Photo: Lothar Keselhut showing marked optical cards to children
physical object
Identifier
2016.3.96
Description
Black and white photo of Lothar Keselhut showing optical mark cards to children possibly on a field trip
Related people
Angela Tran
(is documentarian of)
Jim Marshall
(was donor of)
![[BLANK]](https://computermuseum.uwaterloo.ca/media/computermuseum/images/1/0/95004_ca_object_representations_media_1079_medium.jpg)