Ruler

https://www.wikidata.org/wiki/Q104555

Field Hierarchy

Parent
Physics 33M papers	Quantum mechanics 13.3M papers	Astronomy 2.7M papers
Current
Ruler 9,376 papers
Child
Cyclograph 0 papers	Set square 0 papers	Parallel rulers 0 papers	Measuring ruler 0 papers
Graphometer 0 papers		Straightedge 1 papers

Trends

Notes

History