# Relationship history for MSHA mine 4202682

Current hierarchy: **Linford M Landis; Aaron M Landis → Landis Construction LLC → Blue Hills Gravel Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Landis Construction LLC → Blue Hills Gravel Pit; 2018-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aaron M Landis et al → Blue Hills Gravel Pit; 2018-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron M Landis et al → Landis Construction LLC; 2018-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linford M Landis et al → Landis Construction LLC; 2018-01-25 to current/open; source msha-controller-operator-history