Versions of this image are found in several places online, for instance at the official site of Leica in Russia [2] or the official site of Wild-Heerbrugg in Brasil [3] (see Leitz for the somewhat complicated company history that explains why this Wild Heerbrugg site is relevant). Most likely this is a contemporary portrait.
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این اثر در کشورهایی و مناطقی که مدت زمان حق تکثیر، عمر پدیدآورنده بعلاوه 100 سال یا کمتر بعد از مرگ او است، در مالکیت عمومی قرار دارد.
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[[Carl Kellner]]. Immediate image source: [http://www.musoptin.com/belthle_594.html]. Versions of this image are found in several places online, for instance at the official site of Leica in Russia [http://www.leica-russia.ru/history.htm] or the officia