# Relationship history for MSHA mine 4700802

Current hierarchy: **Charles  Plummer; David  Courtney Jr → 4 X Corp → Courtney & Plummer 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** 4 X Corp → Courtney & Plummer Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Plummer  et al → Courtney & Plummer Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Plummer  et al → 4 X Corp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Courtney Jr  et al → 4 X Corp; 1950-01-01 to current/open; source msha-controller-operator-history