Asymmetric register keys

From Clarinet Wiki

Seemingly a fairly new development: asymmetric "ergonomic" register key. Similarly shaped register keys have existed on saxes for a long time. See discussions:

• [1] (July 2007)
• [2] (January 2008)

Some specific clarinets having it:

Maker	Model	Years	Discussion	Photos	Notes
Hanson	?	?		Hanson	Photo appears to be one of a group of pictures of a bass clarinet.
Forte'	Student B-flat	2004 -	Forte', Forte'	Forte'	"Sculpted ergonomic register key", not quite the same kind of key as others discussed here.
	Professional C	2006 -	Forte', Forte'		"Sculpted ergonomic register key", not quite the same kind of key as others discussed here.
Leblanc	Robert Lowrey	?
Marigaux	RS Symphonie	2001 or earlier - 2003?	Clarinet BBoard, Hochstrasser.org	Hochstrasser.org	Marigaux stopped making clarinets in about 2003. The Symphonie is mentioned on their web site in 2001 (earliest archived date).
Ridenour	TR-147	? - 2006	Clarinet BBoard	rsholmes	Earlier versions of the TR-147 had a standard register key.
	Lyrique	2007 -	Clarinet BBoard	Ridenour	Earlier versions of the Lyrique (early 2007) had a standard register key. Quoted comments from Tom Ridenour (see discussion) suggest there may have been legal reasons for not using the asymmetric key from the beginning.
Rossi	all?			Rossi	"as long as there have been Rossis"
Selmer	Privilege	2007? -		Clarinet BBoard
	33 bass	?			"'sculpted' reg. key, in the manner of the Lowry"