❪✺₃ₕ❫ Physical Standards ○ Relationships

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• ❪✺₃❫ Physical Particulars ○
• ❪✺₃ₕ❫ Standards ○

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• ❪✺₃ₕ❫ Astronomical Standards ○
• ❪✺₃ₕ❫ Electromagnetic Standards ○

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