"PA GG-1" refers to the Pennsylvania Railroad GG1 electric locomotive .
"Grit Gauze" indicates a mesh with a relatively thick thread diameter and a square weave, making it durable enough to handle heavy loads and "gritty" particles. Typical Specifications (from PDF data) 1 PA GG pdf
It may appear as a shorthand for specific Professional Associations or General Guides in niche PDF documents, though the milling mesh is the most prominent technical use for "1 PA GG". Milling / Müllerei "PA GG-1" refers to the Pennsylvania Railroad GG1
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