Hi all friends of Argentina, the pictures of the organ console in MMD
210316 show a complete set of relays for the pedal and three manuals,
each manual with 56 numbered solder points for 56 notes.

The inscriptions there are (all?) in German, not French. The single word
on the middle of the upper cover bar is "�ffnungen" for openings or
(also French) apertures. On right side is "Pedal" for pedal (in French
"pedale") with points for 12 notes. The French inscriptions on the
buttons of the service panel might have been added later.

Are there the three remaining holes in the tracke bar used for switches
for the manuals? The white ceramics are used as open mercury switches
and are often found in German electric pianos up to the nineteen-twenties.

But I have no idea wherever a 71-hole tracker was installed. Popper
offered since about 1910 a reproducing reed organ, which later was
offered with a combined tracker bar for the use of Aeolian Grand rolls,
too. No instrument is known today.

Hans Schmitz
Stuttgart