TY  - JOUR
AU  - Pakes,Ariel
AU  - Simpson,Margaret
TI  - Patent Renewal Data
JF  - National Bureau of Economic Research Reprint Series
VL  - No. 1265
PY  - 1989
Y2  - September 1989
UR  - http://www.nber.org/papers/r1265
N1  - Author contact info:
Ariel Pakes
Department of Economics
Harvard University
Littauer Room 117
Cambridge, MA 02138
Tel: 617/495-5320
Fax: 617/496-7352
E-Mail: apakes@fas.harvard.edu
AB  - 
ER  -