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  <!-- ── Mechanical Calculators ── -->
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  <!-- ── Civil Calculators ── -->
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  <!-- ── Physics Calculators ── -->
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  <!-- ── Electronics Calculators ── -->
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  <!-- ── Health Calculators ── -->
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  <!-- ── Financial Calculators ── -->
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  <!-- ── General / Math Calculators ── -->
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  <!-- ── AI Discovery files (linked here so AI crawlers find them) ── -->
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