SIC 3661 — Telephone and Telegraph Apparatus
Description & Classification
SIC code 3661 representing 'Telephone and Telegraph Apparatus' is an industry category in the Standard Industrial Classification (SIC) system under U.S. OSHA and Federal procurement registers.
Modern NAICS Crosswalk
Trace the modern equivalent classifications in the 2022 North American Industry Classification System (NAICS) database:
- NAICS 334418 - Printed Circuit Assembly (Electronic Assembly) Manufacturing (via SIC1987:3661→NAICS1997:334418→2002:334418→2007:334418→2012:334418→2017:334418→2022:334418)
- NAICS 334210 - Telephone Apparatus Manufacturing (via SIC1987:3661→NAICS1997:33421→2002:334210→2007:334210→2012:334210→2017:334210→2022:334210)
Classification Details
| SIC Code | 3661 |
|---|---|
| Industry Title | Telephone and Telegraph Apparatus |
| Division | Division D: Manufacturing |
| Major Group | Major Group 36: Electronic and Other Electrical Equipment and Components |
| Source / Verified | US Census 1987 SIC Concordance / 2026-06-28 |
Related Resources & Compliance Guides
Further regulatory reference links for legacy SIC code 3661:
- SIC Codes Complete Compliance Guide — Detailed history and active legal applications of the SIC classification framework.
- Why Legacy SIC Codes Persist Guide — How credit systems and the SEC still rely on SIC metadata.
- SIC ↔ NAICS Crosswalk Tool — Trace industrial code conversions dynamically.
- SIC Major Group 36 Hub — View other legacy industries in this business division.
Related Industries in Major Group 36
Frequently Asked Questions (FAQ)
What industry does SIC code 3661 represent?
SIC 3661 is 'Telephone and Telegraph Apparatus', a 4-digit Standard Industrial Classification (SIC) code under Major Group 36: Electronic and Other Electrical Equipment and Components (Division D: Manufacturing); it maps to modern 2022 NAICS code(s): 334418 (Printed Circuit Assembly (Electronic Assembly) Manufacturing), 334210 (Telephone Apparatus Manufacturing).
What is the modern 2022 NAICS mapping for SIC 3661?
SIC code 3661 maps to modern NAICS codes: 334418 - Printed Circuit Assembly (Electronic Assembly) Manufacturing, 334210 - Telephone Apparatus Manufacturing.