# Relationship history for MSHA mine 0504715

Current hierarchy: **Al  Lunbery; Tom  Lefever → Star Ready Mix → Star Sand/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:** Star Ready Mix → Star Sand/Gravel; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Lefever  et al → Star Sand/Gravel; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Lefever  et al → Star Ready Mix; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Al  Lunbery  et al → Star Ready Mix; 2001-08-01 to current/open; source msha-controller-operator-history