This patent appears to be for the, crude but original, b-pivot adjustment system on a Sun-Bow derailleur. It is one of three patents regarding features of this derailleur.
In the various patent databases, this patent is marked with a letter 'U', which may indicate that it is a 'Utiity Model' - which is more like a registered design than a full patent.
I cannot read Japanese, but I am assured that scan 1 also mentions the company name 'Yamashita Iron Works Ltd', and the address 'No 36 Sambocho 4-Cho, Sakai, Osaka'. This is the name and address given on the SY advert on page 254 of the 1956 Japan's Bicycle Guide.
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