# Relationship history for MSHA mine 5001985

Current hierarchy: **Patricia  Lankford; Steve  Lankford → 4/S Services → Albert Creek Mine**

- 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:** 4/S Services → Albert Creek Mine; 2012-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patricia  Lankford et al → Albert Creek Mine; 2012-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Lankford et al → 4/S Services; 2012-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Lankford et al → 4/S Services; 2012-06-29 to current/open; source msha-controller-operator-history