# Relationship history for MSHA mine 0301931

Current hierarchy: **Michael W  Landrum; Selden L  McMillin Jr → Lansel Materials LLC → H M B Materials**

- 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:** Lansel Materials LLC → H M B Materials; 2006-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael W  Landrum et al → H M B Materials; 2006-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael W  Landrum et al → Lansel Materials LLC; 2006-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Selden L  McMillin Jr et al → Lansel Materials LLC; 2006-05-25 to current/open; source msha-controller-operator-history