Priority date (The priority date 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 date listed.)
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Publication date
Priority claimed from CA277,125Aexternal-prioritypatent/CA1086475A/en
Application filed by Grace W R & CofiledCriticalGrace W R & Co
Priority to NZ188059ApriorityCriticalpatent/NZ188059A/en
Priority to NZ187087Aprioritypatent/NZ187087A/en
Publication of NZ184255ApublicationCriticalpatent/NZ184255A/en