pääsylokejen

I’m unable to find reliable sources or a clear definition for the term “pääsylokejen.” It does not appear as a widely used Finnish term in accessible references. Could you please share the context or field where you encountered it (e.g., history, engineering, literature, a regional dialect, or a specific source)? If you can provide a source or clarify its meaning, I can draft a concise, neutral wiki-style article (under 300 words).