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I found a 5th source and there are Marocchi AND Majocchi!
So far I have:
Beauieu & Georgano's New Encyclopedia:
MAROCCHI 1900-1901Fratelli Marocchi2-seater 3-wheeler, 2rear 1front, a motorised bath chair in appearance, two 1 \12hp single-cylinder engines, one
on each side of the front wheel. Tiller steering
Enciclopedia Milleruote:
AQUILA 1900-1906Fratelli Majocchi2-seater 3-wheeler, 2rear 1front, a motorised bath chair in appearance, one 1 1/2hp single-cylinder engines,
on the front wheel.
Tiller steering
MAROCCHI 1900-1901Fratelli Marocchi2-seater 3-wheeler, 2front 1 rear, a motorised bath chair in appearance, two single-cylinder engines,
one on each front wheel.
The new source:
AQUILAOfficine Fratelli MajocchiLittle 'Vetturetta' realized in 2 models by Officine Fratelli Majocchi
MAJOCCHI 1898-1906Officine Fratelli Majocchia 3-wheeler, 2front 1 rear, one 3hp engine,on the front wheel. Brand name Aquila.
a 4-wheeler with 2 engines united.
MAROCCHI 1900-19012-seater 3-wheeler, 2rear 1front, a motorised bath chair in appearance, two 1 1/2hp single-cylinder engines,
one on each rear wheel.
Tiller steering