{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"A study of the effect of momentary external fields on the retentivity of the permanent magnets of recording wattmeters","author_name":"Leslie E Simmons","thumbnail_url":"https://www.ebooknetworking.net/books/124/509/big1245092006.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1245092006.html\">A study of the effect of momentary external fields on the retentivity of the permanent magnets of recording wattmeters</a>","width":400,"height":300}