- Plant Test Number
- 1) Abbreviation: PTN (actual number assigned for 800 service)2) Information technology: PTN (Telephony, actual number assigned for 800 service)
Универсальный русско-английский словарь. Академик.ру. 2011.
Универсальный русско-английский словарь. Академик.ру. 2011.
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