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Central Building Research Institute: Roorkee (UP).
Central Drug Research Institute: Lucknow (UP).
Central Food Technological Research Institute: Mysore.
Central Leather Research Institute: Chennai.
Central Mining Research Station: Dhanbad (Bihar).
Central Road Research Institute: New Delhi.
Indian Institute of Petroleum: Dehra Dun (Uttaranchal).
National Aeronautical Laboratory: Bangalore.
National Chemical Laboratory: Pune.
National Environment Engineering Research Institute (NEERI): Nagpur.
National Institute of Oceanography: Panaji (Goa).
National Physical Laboratory: New Delhi.
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ആറങ്ങോട്ടു സ്വരൂപം വള്ളുവനാട്‌.
ഇളയിടത്ത്‌ സ്വരൂപം കൊട്ടാരക്കര.
എളങ്ങല്ലൂർ സ്വരൂപം ഇടപ്പള്ളി.
തരൂർ സ്വരൂപം പാൽക്കാട്‌.
തൃപ്പാപ്പൂർ സ്വരൂപം തിരുവിതാംകൂർ.
നെടിയിരുപ്പ്‌ സ്വരൂപം കോഴിക്കോട്‌.
പടിഞ്ഞ്നാറ്റേടത്തെ സ്വരൂപം കൊടുങ്ങല്ലൂർ.
Reference .

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     Postal Index Number (PIN) / PIN Code is a 6 digit code of Post Office numbering used by India Post. The PIN Code system in India was introduced on 15 August 1972 by Shriram Bhikaji Velankar. The system was introduced to simplify the manual sorting and delivery of mail by eliminating confusion over incorrect addresses, similar place names and different languages. .

    There are 9 PIN regions in the country. The first 8 are geographical regions and the digit 9 is reserved for the Army Postal Service. The first digit indicates one of the regions. The first 2 digits together indicate the sub region or one of the postal circles. The first 3 digits together indicate a sorting district. The last 3 digits refer to the delivery Post Office. .

PIN zones cover the Indian states and union territories: .

1 - Delhi, Haryana, Punjab, Himachal Pradesh, Jammu and Kashmir, Chandigarh.
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