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. 24 shown for “Firm of Louis Duchène et Fils” — 64 records examined, 21 dropped by the rights gate.
Archives queried 2026-09-02 15:47 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Watch
Firm of Louis Duchène et Fils · ca. 1815–30
Album of Prints: New Book of Vases by Voisin Fils
François Voisin, French, active 18th century · 1786-1789
Table clock with calendar
Lucien Falize · 1881
Plan Coupe et Elévations d’une Melonnière éxécutée des chez Mr. J.B. Paulée à Douay, dépt. Du Nord, d’après les Déssins de Mr. Belanger fils
Jean-Charles Krafft, French, 1764 - 1833 · 1812
Watch
Firm of Sandoz, Ami, et Fils · 1840–55
Wallpaper Invoice for the firm of Arthur et Robert
Arthur & Robert · 1793
Watch
Firm of Alliez, Bachelard et Terond Fils · ca. 1830
Oeuvres de François de Cuvilliés, fils, Ecole d'architecture Bavaroise, Suite 1-20; 4th Recueil (of François de Cuvilliés, pere et fils; Vue Perspectives; Recueil de Ponts Anciene et Moderne; Nouveau Recuil de Ponts Modern
François de Cuvilliés, fils · 1768–73
Antoine Laurent Lavoisier (1743–1794) and Marie Anne Lavoisier (Marie Anne Pierrette Paulze, 1758–1836)
Jacques Louis David · 1788
Ornamental Vase Design
François Voisin, French, active 18th century · 1786-1789
The Death of Socrates
Jacques Louis David · 1787
Fils de Louis XI
Artist not stated in the record · 1872
Figures françoises et comiques nouvellement inventées par M. Watteau; Figures de modes dessinées et gravées à l'eau forte par Watteau; a terminées au buin par Thomassin le fils
Antoine Watteau · 1710?–?1720
The Four Seasons
B. M. Lebert, 1759–1836 · 1818–20
Reduction et Frappe de Medailles
Alexandre-Louis-Marie Charpentier · ca. 1900–1910
Almanac for the Second Half of the Year 1792
Artist not stated in the record · 1791
Pocket watch
Firm of Breguet et Fils · ca. 1900
NEUVIEME LIVRE D’ORNEMENS Propre pour la Menuiserie Inventé par Mondon Fils
Jean Mondon, French, fl. 1736 – 1745 · mid- 18th century
Vase with scenes of storm on land
Dihl et Guérhard · ca. 1797–98
Title Page
François de Cuvilliés the younger, German, 1731 - 1777 · 1745
Vase with scenes of storm at sea
Dihl et Guérhard · ca. 1797–98
La fils du fernier, from La vie de château
Lami-Denozan Libraire, French, active 19th c. · 1832
Watch
Firm of D. Bachelard et Fils · mid-19th century
Élévation Géometralle d’une Décoration pour un feu d’artifice qui devait être exécuté de reliéf a Nimphembourg, dedié a S.A.S.E. de Baviere par son tres humble tres obeissant et tres Respectueux Serviteur et sujet, F. de Cuvillies fils
François de Cuvilliés the younger, German, 1731 - 1777 · 1770
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. 186 matched · 24 examined · 1 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. 2952548 matched · 40 examined · 20 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 2026-09-02 15:47 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.