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. 14 shown for “Bramwell Valve, Patent Model” — 42 records examined, 25 dropped by the rights gate.
Archives queried 2026-09-05 20:41 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Tenor valve trombone
Adolphe (Antoine Joseph) Sax · ca. 1863
Bramwell Valve, Patent Model
Artist not stated in the record · 1859
Baritone shoulder horn in B-flat
Henry G. Lehnert · after 1875
Cameron Pump Valves, Patent Model
Artist not stated in the record · 1874
Carhart Balanced Valve, Patent Model
Artist not stated in the record · 1866
Corliss Exhaust-Valve Gear, Patent Model
Artist not stated in the record · 1876
Thompson Balanced and Cut-Off Valve, Patent Model
Artist not stated in the record · 1875
Allen Two-Motion Cone-Valve, Patent Model
Artist not stated in the record · 1855
Sickels Tripping Cut-Off Valve, Patent Model
Artist not stated in the record · 1852
Bartlett Poppet Valve Gear, Patent Model
Artist not stated in the record · 1867
Richards Balanced Valve, Patent Model
Artist not stated in the record · 1866
Scheidler and McNamar Throttle Valve, Patent Model
Artist not stated in the record · 1875
Fitts Governor Valve, Patent Model
Artist not stated in the record · 1859
Dow Direct-Acting Steam Pump, Patent Model
Artist not stated in the record · 1879
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. 40419 matched · 40 examined · 25 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 2026-09-05 20:41 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.