Aircraft engine built by the two, in Melbourne in 1910. (see Robbins-Lock).

-It was custom built, ordered by L. Marshall to provide 50 hp to his Bleriot type monoplane, from which we do not know if it had flown or if they had to abandon the project because of financial problems.

-If we put the engine at its time, it already had features of today's engines in many of its details.

“Azor y Aubrey horizontally-opposed, 4-cylinder engine”

-Sometimes they are also referred to as Audrey Lock - Azor Robbins.