Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Mastraggelis was the brand name of the company founded by the Mastraggelis Brothers in Aigaleo (Athens), Greece. Mastraggelis became mostly known for its production of bus bodies, as well as other metal structures, but it also produced complete three-wheeled trucks between 1968 and 1974. The trucks, not particularly successful compared to other Greek three wheelers, could be distinguished by their characteristic cab design.
References
Lampros S. Skartsis; Geōrgios A. Avramidēs (2003). Made in Greece : to hellēniko autokinēto, ochēma kai aeroskaphos (in Greek). Patras, Greece: Typorama. ISBN960-7620-30-5. (Republished by the University of Patras Science Park, 2007.)