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 “Ayer's Patent Model of a Refrigerator Car - 1876” — 40 records examined, 15 dropped by the rights gate.
Archives queried 2026-08-31 23:38 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Ayer's Patent Model of a Refrigerator Car - 1876
Artist not stated in the record · 1876
Refrigerator patent model made by Thomas Elkins
Thomas Elkins, American · 1879
Patent Model, Endless Chain Propeller
Artist not stated in the record · 1876
Plunger Propulsion, Patent Model
Artist not stated in the record · 1876
1858 - Wm. P. Uhlinger's Patent Model for a Sewing Machine Cabinet; Pat. # 22,464
Artist not stated in the record
Morris Lancaster's 1876 School Desk and Seat Hinge Improvement Patent Model
Artist not stated in the record · 1876
Corliss’ Patent Model of a Steam Pump - 1876
Artist not stated in the record · 1877
Rotary Measure, U.S. Patent Office Model
Artist not stated in the record · 1876
Patent model of a Feeding Apparatus for Card Presses
Clark, William M. · ca 1876
Schofield Rotary Engine, Patent Model
Artist not stated in the record · 1876
Patent model for printers' quoins
Polen, George B. · ca 1876
Herbert L. Andrews' 1868 School Desk Patent Model Improvement
Artist not stated in the record · 1868
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. The archive returned no records for this term.0 matched - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 3864862 matched · 40 examined · 15 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-08-31 23:38 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.