Editing Contra-alto clarinet (section)

===20th century===
* {{ill|Georges Leblanc Paris|fr}} built two models of a contra-alto clarinet in E-flat, Model 350 and 352,<ref>Lucien Cailliet, The Leblanc Contralto and Double Bass Clarinets (book)</ref> from [[metal]]. Model 350 was in a curved shape (known as a ''paperclip'') and went to written low C. These models also have three trill keys on the right side of the upper joint. The curved shape makes the instrument much easier to transport than the traditional straight, non-dismantled model.<ref>{{Cite web|url=http://www.lynsgarden.co.uk/Rosecroft/Eb_Contra-alto.html|title=Eb_Contra-alto|website=www.lynsgarden.co.uk|accessdate=2 October 2021}}</ref> Model 352 was straight in a bass clarinet-shape to written low E♭.

Other makers of contra-alto clarinets have developed mainly stretched models. These include:
* [[Henri Selmer Paris]]
** Model 26/40 in rosewood to written E, E♭, or D
* [[Buffet Crampon]]
** Metal model patented in 1891 for Evette and Schaeffer (patent FR218373/5)<ref>{{Cite web|url=http://clariboles-et-cie.blogspot.com/2008/12/clarinettes-graves-en-mtal-post-2.html|title=Le chtiot musée des Clariboles et Cie: Clarinettes graves en métal (Post 2)|date=7 December 2008|accessdate=2 October 2021}}</ref>
** Model Prestige 1553 made of grenadilla, 19 keys.
* [[Selmer Company|Conn-Selmer USA]] (1980 onwards), Bundy (from 1964<ref>"Now! A clarinet choir of your own" (Selmer advertisement: "Selmer's newest Resonite—the E flat Contra"). Music Educators Journal 51:1 (September-October 1964).</ref> to 1980), Buescher ({{circa}} 1968–1969): model 1440 made of [[ebonite]], to written  E♭ (written), with 18 keys and 7 plateau keys.
* Leblanc USA / Vito: Model L7181 in Reso-Tone material to E flat (written).
* Ripamonti, Italian manufacturer: model 322 in [[rosewood]], to d (written).
* Martin Frères Company<ref>{{Cite web|url=https://martinfreres.net/clarinetcatalog/low-clarinets/|title=Alto, Bass & Contra Clarinets &#124; Martin Freres Company|date=6 March 2015 |accessdate=2 October 2021}}</ref>
** EE-3488 model in ABS
** EE-3434 model in ebonite
* Harry Pedler, Inc. (Elkhart, IN) was by late 1926 making a contrabass clarinet—presumably an E flat contra-alto.<ref>"Harry Pedler Inc. Reports Increase of Over 30 Per Cent During Last Year." The Music Trade Review 84:1 (1 January 1927), 26.</ref>

Today's contra-alto clarinets are mainly based on the [[Boehm system]], Foag Klarinettenbau offers two models with the German system.