Catalogued
Signal progression time-space diagram
- Made by
- US urban traffic signal practice; no single originator
- Year
- 1920s
- Field
- Engineering
- Kind
- Data display
- Room
- Lives and events — Placed by reading its description, not yet studiedCould also hang in: Change over time
2 other forms share this skeleton
Source
Harris 1999, Information Graphics
Attribution less certain: contested, or no single inventor recorded