Image: River mill dam governor test
Size of this preview: 785 × 600 pixels. Other resolutions: 314 × 240 pixels | 6,292 × 4,807 pixels.
Original image (6,292 × 4,807 pixels, file size: 28.01 MB, MIME type: image/png)
Description: River mill hydroelectric project. glass plate negative
Title: River mill dam governor test
Credit: Portland General Electric.
Author: Portland General Electric.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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