<https://ahooza.com/product/neelkanth-a-comprehensive-trade-question-bank-mechanic-refrigiration-and-air-conditioning-in-hindi/#product>
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"Publication: Neelkanth Publishers\r\n \tAuthor: Neelkanth Publishers\r\n \tASIN No: 9789387339903\r\n \tEdition: New\r\n \tBinding: Paperback\r\n \tLanguage: Hindi\r\n \tPage: 110"
<https://ahooza.com/product/neelkanth-a-comprehensive-trade-question-bank-mechanic-refrigiration-and-air-conditioning-in-hindi/>