Image: Simjian Prompting device
Size of this preview: 354 × 600 pixels. Other resolutions: 141 × 240 pixels | 812 × 1,376 pixels.
Original image (812 × 1,376 pixels, file size: 137 KB, MIME type: image/png)
Description: Luther Simjian
Title: Simjian Prompting device
Credit: https://patents.google.com/patent/US2796801A/
Author: Luther Simjian
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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