Fixed capacitors for use in electronic equipment - Part 4-1: Blank detail specification - Fixed aluminium electrolytic capacitors with non-solid electrolyte - Assessment level EZ (IEC 60384-4-1:2007). (Endorsed by AENOR in September of 2007.)
Edition 2007-09-01

Connectors for electronic equipment - Tests and measurements - Part 4-1: Voltage stress tests - Test 4a: Voltage proof
Edition 2004-04-30

QUARTZ CRYSTAL CONTROLLED OSCILLATORS OF ASSESSED QUALITY. PART 4-1: BLANK DETAIL SPECIFICATION. CAPABILITY APPROVAL (Endorsed by AENOR in July of 1998.)
Edition 1998-07-01

Digital audio interface - Part 4-1: Professional applications - Audio content (Endorsed by AENOR in August of 2016.)
Edition 2016-08-01

Radio frequency and coaxial cable assemblies - Part 4-1: Blank detail specification for semi-rigid coaxial cable assemblies (Endorsed by AENOR in March of 2004.)
Edition 2004-03-01

Industrial communication networks - Fieldbus specifications - Part 4-1: Data-link layer protocol specification - Type 1 elements (Endorsed by AENOR in December of 2014.)
Edition 2014-12-01

Radio-frequency connectors - Part 41: Sectional specification for CQA series quick lock R.F. coaxial connectors (Endorsed by AENOR in September of 2011.)
Edition 2011-09-01

Materials for interconnecting structures - Part 4-1: Sectional specification set for prepreg materials, unclad (for the manufacture of multilayer boards) - Epoxide woven E-glass prepreg of defined flammability. (Endorsed by AENOR in September of 2008.)
Edition 2008-09-01

Optical amplifiers - Test methods - Part 4-1: Gain transient parameters - Two-wavelength method (Endorsed by Asociación Española de Normalización in February of 2017.)
Edition 2017-02-01

DISTRIBUTION AUTOMATION USING DISTRUTION LINE CARRIER SYSTEMS. PART 4: DATA COMMUNICATION PROTOCOLS. SECTION 41: APPLICATION PROTOCOLS. DISTRIBUTION LINE MESSAGE SPECIFICATION (Endorsed by AENOR in November of 1997.)
Edition 1997-11-01