IS 9891 : Part 4 : 1981 Specification for Edge Connectors for Printed Wiring Board and Insulated Board Having Contact Pitch 2.54 mm - Part 4 : Non-polarised Socket Types 9891 IS-03-11/25/33-W/1-A/B-0.75
| UDC 621.315.683:621.3.049.75 : 620.1 : 621.36.038 | LTD 3 |
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| Reaffirmed 2016 |