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. 15 shown for “Duct Flute” — 64 records examined, 48 dropped by the rights gate.
Archives queried 2026-09-05 13:41 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term..jpg&w=3840&q=75)
Duct Flute
Artist not stated in the record · late 19th century
Design for a Mass-Operational House Designed by Hector Guimard, Chimney Duct Construction
Hector Guimard, French, 1867–1942 · October 1920
Flute
Artist not stated in the record · 1300–1500
Hiller Model 1031-A-1 Flying Platform
Artist not stated in the record
Duct Flute
Artist not stated in the record · late 19th century
Sturtevant’s Patent Model of a Heating and Ventilating Apparatus – ca 1870
Artist not stated in the record · ca 1870
Courting flute (siyotanka)
Artist not stated in the record · ca. 1850–1900
Vertical Duct Flute in D
H. Boulanger et Cie · 19th century
Double Whistle
Artist not stated in the record · 7th–9th century
Soprano Recorder in B
Thomas Coenraet Boekhout · ca. 1700
Alto Recorder in F
Johann Benedikt Gahn · ca. 1700
Flute
Artist not stated in the record · 16th century (?)
Flute
Artist not stated in the record · 200 BCE–100 CE
Flute
Artist not stated in the record · 200 BCE–100 CE
Flute
Artist not stated in the record · 200 BCE–100 CE
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. 440 matched · 24 examined · 11 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 3209 matched · 40 examined · 37 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.3 shown
These figures describe the pass run at 2026-09-05 13:41 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.