A model of a device or tool used for scientific purposes, including the study of both natural phenomena and theoretical research.1
This entity represents a class of devices of one type.
Even a unique Instrument Instance should have its Instrument Model to represent its important properties.
None besides those of Infrastructure.
Besides those of Infrastructure:
has-instance / is-instance-of : An Instrument Model can have any number of Instrument Instances.
[1] Source: Adapted from the Wikipedia Scientific Instruments article as of 2026-09-28, which attributes the formulation to:
Hessenbruch, Arne (2013). Reader's Guide to the History of Science. Taylor & Francis. pp. 675–77. ISBN 9781134263011.