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.)
Expired
Application number
CA611889A
Inventor
S. Krieger Richard
J. Porter William
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PARKMASTER ELECTRONIC RESEARCH
Original Assignee
PARKMASTER ELECTRONIC RESEARCH
Publication date
Application grantedgrantedCritical
Publication of CA611889ApublicationCriticalpatent/CA611889A/en