Maestro effects have a long history with a claim to have produced the first distortion pedal recorded with Stones – Satisfaction.

http://johannburkard.de/blog/music/effects/legendary-guitar-effects-maestro-fuzz-tone-fz-1-fz-1a-fz-1b.html

Maestro Effects Technical Service Manuals (from Dredge Tone Internet Archive)

Maestro Fuzz

Maestro Fuzztain

Maestro Stagephaser

Maestro Phaser

Image Maestro Fuzztain & Sustainer eBay:

Maestro_fuzztain-pedal

Maestro