Hello,
Currently on ebay is a photo of a rare bird a Lendner Doppeldecker at:
https://www.ebay.de/itm/154693442982...0AAOSwP9Zhi4ML
Not much on the machine in Typenhandbuch Luftfahrttechnik and no reason to suppose there was any military interest, though the officer in the photo is intriguing.. In any evennt the designer Leo Lendner was killed when the machine crashed on 07.07.1913 .
Regards,
Clint