This unassuming catalogue gives very little away. There is no photo of the factory, made to look massive by the cunning use of a wide-angle lens. There are no rousing but meaningless quotes from the owner/manager and there is no history page claiming that the company has been in business for oh-so-many years. Even the date is missing.
In terms of derailleurs, the photos are blurry and the text is unspecific, but my guess is that this catalogue shows three models:
I am guessing that this document dates from sometime around 1973, based largely on three 'facts':
If this 1973 date is real, this is one of the older pieces of Taiwanese literature on this site - and very much valued for that.