· establecido ntc-6047, ntc-4140, ntc-4143, ntc-4145, ntc.4201, ntc-4349, nic-4595, ntc4732, 12...
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- · establecido NTC-6047, NTC-4140, NTC-4143, NTC-4145, NTC.4201, NTC-4349, NIC-4595, NTC4732, 12 de 1987,
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