How has the grading system for comic books evolved over the years, and what are the main differences between grading standards used by different organizations (e.g., CGC, CBCS)?

How has the grading system for comic books evolved over the years, and what are the main differences between grading standards used by different organizations (e.g., CGC, CBCS)?
Admin 20 hours, 57 minutes ago in Comic Books & Memorabilia
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