Douglas A Messmer from Minneapolis, MN

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Industry:

Logistics And Supply Chain

Work:

DSCP-E
Navy Specialist

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Work:

Inventory Management Specialist

Educational Learning Device
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US Patent:

39479781, Apr 6, 1976
Filed:

Jan 31, 1974
Appl. No.:

5/438255
Inventors:

Neil M. Clark - St. Louis Park MN
Douglas A. Messmer - Minneapolis MN
Assignee:

Techpower, Inc. - Minneapolis MN
International Classification:

G09B 706
US Classification:

35 48R
Abstract:

An answer card and an educational device are disclosed wherein a flexible card has answer selection points on a first side and at least one electrically conductive ink spot on the second side opposite a selection point. The electrically conductive ink spot acts as a switch when the selection point opposite the spot is pressed causing the electrically conductive ink to bridge an open-circuited educational device.