राज कुमार गुप्ता आटा चक्की एण्ड स्पेलर

local listings: Use local business directories (Justdial, IndiaMART, etc.) — search “Raj Kumar Gupta atta chakki Lucknow” or “Gupta atta chakki supplier”.
Ask neighbours / shops: Local retailers or grocers may know which chakki supplies large quantities and could give you contact.
Online marketplaces: Sometimes atta chakki machines or suppliers serve via TradeIndia, ExportersIndia etc. You might get supplier leads.