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
CA15938F
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.)
Julius E Hansen Bay State Opticla Co
Original Assignee
Julius E Hansen Bay State Opticla Co
Publication date
Priority to CA15938FpriorityCriticalpatent/CA15938S/en
Application grantedgrantedCritical
Publication of CA15938SpublicationCriticalpatent/CA15938S/en