# Relationship history for MSHA mine 4605812

Current hierarchy: **Lebkuecher Ralph P → Eastern Resources Inc → Apache No 1 Surface**

- 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

- **controller_controls_mine:** Lebkuecher Ralph P → Apache No 1 Surface; 1978-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thermo Fossil Resources Inc → Apache No 1 Surface; 1978-08-01 to 1979-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Lebkuecher Ralph P → Apache No 1 Surface; 1978-08-01 to 1979-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Lebkuecher Ralph P → Thermo Fossil Resources Inc; 1978-08-01 to 1979-06-19; source msha-controller-operator-history
- **operator_operates_mine:** B & P Excavating Inc → Apache No 1 Surface; 1979-06-20 to 1979-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Panson George → Apache No 1 Surface; 1979-06-20 to 1979-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Panson George → B & P Excavating Inc; 1979-06-20 to 1979-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Resources Inc → Apache No 1 Surface; 1979-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lebkuecher Ralph P → Eastern Resources Inc; 1979-12-14 to current/open; source msha-controller-operator-history