# Relationship history for MSHA mine 1900331

Current hierarchy: **John  Mackin; Kimberly A Hogan → Mackin Construction Company Inc → Mackin Sand And Gravel**

- 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:** Mackin Construction Company Inc → Mackin Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael P  Mackin → Mackin Sand And Gravel; 1950-01-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Michael P  Mackin → Mackin Construction Company Inc; 1950-01-01 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_mine:** John  Mackin → Mackin Sand And Gravel; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Mackin → Mackin Construction Company Inc; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kimberly A Hogan → Mackin Construction Company Inc; 2016-01-01 to current/open; source msha-controller-operator-history