# Relationship history for MSHA mine 0101656

Current hierarchy: **Tittle Marlene → Higher Quality Coal Company Inc → Higher Quality Coal Co Inc Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Higher Quality Coal Company Inc → Higher Quality Coal Co Inc Strip; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tittle Marlene → Higher Quality Coal Co Inc Strip; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tittle Marlene → Higher Quality Coal Company Inc; 1976-12-01 to current/open; source msha-controller-operator-history