# Relationship history for MSHA mine 0900233

Current hierarchy: **Marvin  Higginbotham → Veribest Blue Quarries, Inc. → American Blue Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Imperial Quarries Inc → American Blue Quarry; 1950-01-01 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Gordon G  McIntosh Jr → American Blue Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gordon G  McIntosh Jr → Imperial Quarries Inc; 1950-01-01 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Peppers Randy → American Blue Quarry; 1991-07-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Marvin  Higginbotham → American Blue Quarry; 2002-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Blue Quarries, Inc. → American Blue Quarry; 2004-04-01 to 2005-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Sharon A  Maxwell → American Blue Quarry; 2004-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharon A  Maxwell → American Blue Quarries, Inc.; 2004-04-01 to 2005-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Veribest Blue Quarries, Inc. → American Blue Quarry; 2005-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin  Higginbotham → Veribest Blue Quarries, Inc.; 2005-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peppers Randy → Veribest Blue Quarries, Inc.; 2005-10-20 to 2001-12-31; source msha-controller-operator-history