Flauto Aperto Italian?

Mentioned only by Williams, who defines it only as “open flute”.

Examples

All known examples are listed below.

Flauto Aperto 8', Gran Organo; Auditorio Nacional, Mexico City, Mexico; Tamburini 1958.

Flauto Aperto 8', Eco-Expresivo; Auditorio Nacional, Mexico City, Mexico; Tamburini 1958.

Flauto Aperto 8', Grand Organo; Basilica St. Pietro, Vatican, Italy; Tamburini 1954-62.

Bibliography