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  face view.  Imprint reads:  „Eros” L. & C. Hardtmuth. Patent<illegible>
  side view
  isolated clamping rod gift from Andrey Gordenco

L. & C. Hardtmuth “Eros”

L. & C. Hardtmuth, Vienna, Austria

purpose
lead diameter
mechanism
composition
variations
production date
origin
general
2 mm
friction clutch
hardwood
none known
c. 1904
Austria
 
see also Austrian patent No. 183964
The mechanism of this pencil is similar to those described in roughly a dozen patents of varying origin in the late 19th century.  The innovation of this one is the hook at the end of the long tail of the wedge, allowing the lead to be retrieved easily if broken.  In some of the other similar friction clutch mechanisms the inventors seem to have overlooked this essential feature.