Marine Anchor-Chain Standard (DIN 766 vs ISO 4565 vs BBB) & Interlink Wear Caliper

Deterministic 5-link cumulative pitch averaging ΔL/5 for ±0.15 mm DIN/ISO/G43/BBB classification + minimum crown wire-diameter caliper at interlink contact engine (.jpg, .heic, .png, .pdf) built for Lewmar, Lofrans, Maggi / Peerless, Rocna / Ultra — zero-upload ephemeral Wasm RAM execution.

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