The Austrians used them as well. Most German WW1 Aircraft used Spandau machineguns. Initially modified ground guns then specifically designed aircraft machineguns.
The Maxim also fielded the MG08/15, which was meant to be a portable "light" MG, but was barely adequate for the role. It consisted of a standard MG08, but with a bulky pistol grip and buttstock added, along with a front bipod on the waterjacket. Even more unwieldy was the spool type "Drum" added to the side to keep ammo out of the dirt and more or less coiled on the side of the gun.
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