Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pate nt-An SPRU ch:
Ein Sicherheitssteigbügel mit sich drehenden Rollen, dadurch gekennzeichnet, dafs die
Rollen (a b) an den beiden Schenkeln des die Fufsplatte (d) tragenden Bügels (c) angeordnet
sind.
Improvements in the Production of Prints by Photography, or by Photography Combined with Typographic or other Printing, and in Apparatus for the Purpose.