Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Pearling, Testimony of an Island Economy' has mentioned 'Japan' in the following places:
Occurrence Sentence Text Source
The site is the last remaining complete example of the cultural tradition of pearling and the wealth it generated at a time when the trade dominated the Gulf economy (2nd century to the 1930s when Japan developed cultured pearls).
A few distinctive commercial and residential buildings remain as a testimony to this proud but dangerous and demanding economic activity which suffered a sudden and catastrophic demise in the 1930s as a result of the development in Japan of cultured pearls from freshwater mussels.