OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 12 shown for “Carpenter Compound Hydraulic Engine, Patent Model” — 42 records examined, 30 dropped by the rights gate.
Archives queried 2026-09-05 20:17 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Pair of Forsyth Patent Third Model Sliding Primer Pistols
Alexander John Forsyth · ca. 1828
Carpenter Compound Hydraulic Engine, Patent Model
Artist not stated in the record · 1878
Forsyth Patent Second Model Sliding Primer Over-and-Under Pistol with Case and Accessories
Alexander John Forsyth · ca. 1824
Chandler And Silver Hydraulic Engine, Patent Model
Artist not stated in the record · 1878
John Haworth Hydraulic Turbine, 1878, Patent Model
Haworth, John · 1878
Brooks Water Wheel, Patent Model
Artist not stated in the record · 1880
Doble Water Wheel, Patent Model
Artist not stated in the record · 1899
Worthington Duplex Steam Pump, Patent Model
Artist not stated in the record · 1871
Steam Steering Apparatus, Patent Model
Artist not stated in the record · 1878
Patent Model, Tug for Towing Canal Boats
Artist not stated in the record · 1871
Patent model for printing on pyroxyline compounds (celluloid)
Lefferts, Marshall C. · ca 1886
Patent Model for an Ellipsographic Copying Machine
Carpenter, Luman · ca 1842
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 2 matched · 2 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.2 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 64566 matched · 40 examined · 30 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.10 shown
These figures describe the pass run at 2026-09-05 20:17 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.