# Relationship history for MSHA mine 3503252

Current hierarchy: **Robert S  Copeland → Star Group Inc → Ash Bar**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Star Concrete Inc → Ash Bar; 1986-04-01 to 1995-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Bolch Kenneth → Ash Bar; 1986-04-01 to 1995-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Bolch Kenneth → Star Concrete Inc; 1986-04-01 to 1995-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Star Group Inc → Ash Bar; 1995-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert S  Copeland → Ash Bar; 1995-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert S  Copeland → Star Group Inc; 1995-03-23 to current/open; source msha-controller-operator-history