Image: Magnetic wigwag upper quadrant
Size of this preview: 192 × 598 pixels. Other resolution: 229 × 713 pixels.
Original image (229 × 713 pixels, file size: 28 KB, MIME type: image/jpeg)
Description: Type of wigwag signal by Magnetic Signal Co.
Title: Magnetic wigwag upper quadrant
Credit: Magnetic Signal catalog
Author: Unknown authorUnknown author
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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