RHEINISCH-WESTFÄLISCHE TECHNISCHE HOCHSCHULE AACHEN
The Faculty of Mining, Metallurgy and Geo Sciences of the Rheinisch-Westfälische Technische Hochschule Aachen
confers under the rectorate of the university's professor
for Maths Dr.rer.nat. Klaus Habetha
and under the deanship of the university's professor
for Geology and Paleontology Dr.rer.nat. Roland Walter
upon Master in Engineering
Stephan Röper,
born on the 14th of February 1957 in Aachen,
the academic degree of
»PhD in Engineering«
as he has demonstrated his scientific abilities within the stipulated system for the conferral of a doctorate through writing his dissertation on
"Abrasion of casing tubes in deep boreholes due to the rotating drilling string"
and through his oral examination for which he has receive the overall mark
"Very good"
AACHEN, on the 27th of November 1987
THE RECTOR									THE DEAN
[Signature affixed] 								[Signature affixed]
UNDER THE RECTORATE OF THE PERMANENT PROFESSOR
for the History of Architecture and Built Heritage Conservation,
Dr. phil. Günter Urban
THE RHEINISCH-WESTFAELISCHE TECHNISCHE HOCHSCHULE AACHEN
CONFERS THROUGH THIS CERTIFICATE UPON
Mr. Stephan RÖPER
BORN ON THE  			14 February 1957
IN 					Aachen
BASED ON THE EXAMINATION REGULATIONS FOR THE DIPLOMA
IN THE FIELD OF STUDIES IN MINING
THE DEGREE OF
Master in Engineering
AACHEN, ON THE 5th of October 1982				CHAIR OF THE EXAMINATION
COMMITTEE
[Signature affixed]