Iohan Christophe Denner (1655-1707) and his son Jacob Denner (1681-1735) both have been very important woodwind makers in Neurenberg. I.C. Denner was one of the first who was granted by his guild the right to make woodwind instruments in French style. His son Jacob first worked for/with him and when his father died took over the workshop.
My voice-flute is a copy of an instrument by I.C. Denner which nowadays is in the museum in Neurenberg. Whether this instrument must be seen as a voice-flute in French style or as a tenor-recorder in high organ pitch is not completely clear nor whether this would mean a real difference in design or not. What stays is that it is a very beautiful instrument that plays well over all its range and which is, for a voice-flute, rather friendly for the hands to finger.
Tenor 415 Hz
The tenor in A=415Hz I make, is a copy of an instrument by Jacob Denner which is at the moment in the museum in Brussels. Although it looks at the outside like other instrument of Jacob Denner (especially the small foot), the bore design is very similar to the I.C. Denner voice-flute. This tenor does not have a key for the right little finger.
Tenor 440 Hz
For my tenor in 440Hz I took both the voice-flute and the 415Hz-tenor as an example.