# Relationship history for MSHA mine 4400021

Current hierarchy: **Charles S  Luck IV → Luck Stone Corporation → Bull Run Plant**

- 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

- **controller_controls_mine:** Charles S  Luck IV  et al → Bull Run Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bull Run Stone Company Inc → Bull Run Plant; 1950-01-01 to 2002-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Philip I  Bolling → Bull Run Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip I  Bolling → Bull Run Stone Company Inc; 1950-01-01 to 2002-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Luck Stone Corporation → Bull Run Plant; 2002-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles S  Luck IV  et al → Luck Stone Corporation; 2002-06-22 to current/open; source msha-controller-operator-history