Image: Spiral Escalator US Patent 5,158,167 (Pahl 1992) Sketch
Size of this preview: 408 × 599 pixels. Other resolutions: 163 × 240 pixels | 2,320 × 3,408 pixels.
Original image (2,320 × 3,408 pixels, file size: 52 KB, MIME type: image/png)
Description: Spiral Escalator US Patent 5,158,167 (Pahl 1992) Drawing
Title: Spiral Escalator US Patent 5,158,167 (Pahl 1992) Sketch
Credit: US Patent Office
Author: US Patents Office
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
Image usage
The following page links to this image:
All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise.
_Sketch.png){kind=link}