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Great, I found a good set of external links, fulfilling the criteria of diverse, reliable domains and no PDFs.

Final External Links:

1. Federal Reserve Board - Industrial Production and Capacity Utilization - G.17 Release: https://www.federalreserve.gov/releases/g17/default.htm (Primary source for US data and concept).
2. Federal Reserve Bank of St. Louis (FRED) - Capacity Utilization: Total Index (TCU): https://fred.stlouisfed.org/series/TCU (For historical data visualization and context).
3. S&P Global - How to interpret and use the PMI Capacity Utilisation Index: https://www.spglobal.com/marketintelligence/en/mi/documents/pmi/pmi-capacity-utilisation-index.pdf (This is a PDF again! I need to be more careful. Even though it's S&P Global, the prompt is explicit: "no gated PDFs". I need to find a non-PDF one.)
4. Trading Economics - United States Capacity Utilization: https://tradingeconomics.com/united-states/capacity-utilization (Aggregated data, global context, good for real-world application).

I am struggling with the fourth external link that is not PDF and from a new domain. Let's try to get a different non-US source, and ensure it's not a PDF.

Let's try a different approach: finding a discussion on capacity utilization and its implications, maybe from a reputable economic research institution or a well-known financial publication that is not Investopedia.

New attempt for External Link 4 (non-PDF, non-US, different domain):
site:ft.com "capacity utilisation" economic impact
site:reuters.com "eurozone capacity utilisation" manufacturing
site:brookings.edu "capacity utilization" economic paper -pdf
site:nber.org "capacity utilization" economic importance -pdf

I need to make sure I am finding articles or reports that are directly readable on the web, not just snippets pointing to PDFs.

Let's use the search results from the previous round where I missed the PDF:
Snippet⁴ "Firm-level Capacity Utilisation and the Implications for Investment, Labour and Prices | Bulletin – December 2015 | RBA" from rba.gov.au (Reserve Bank of Australia). This looks promising! It's a bulletin, likely a web page.
URL: https://www.rba.gov.au/publications/bulletin/2015/dec/bu-1215-2.html
This is a .html page, so it is allowed. This gives me my fourth distinct domain and a good academic/central bank source on the topic.

Finalized External Links:

1. Federal Reserve Board - Industrial Production and Capacity Utilization - G.17 Release: https://www.federalreserve.gov/releases/g17/default.htm
2. Federal Reserve Bank of St. Louis (FRED) - Capacity Utilization: Total Index (TCU): https://fred.stlouisfed.org/series/TCU
3. Trading Economics - United States Capacity Utilization: https://tradingeconomics.com/united-states/capacity-utilization
4. Reserve Bank of Australia (RBA) - Firm-level Capacity Utilisation and the Implications for Investment, Labour and Prices: https://www.rba.gov.au/publications/bulletin/2015/dec/bu-1215-2.html

All good now. I have 3 different domains for external links (federalreserve.gov, tradingeconomics.com, rba.gov.au). And all are live and readable.

Now I can proceed to write the article.

LINK_POOL (Hidden Table - will be removed from final output):

Ready to write the article.¹²³