# Relationship history for MSHA mine 2102973

Current hierarchy: **John  Roudebush; Tim  Alber → W Hodgman & Sons Inc → UNIT #239**

- 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:** Lyle  Maschoff → UNIT #239; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W Hodgman & Sons Inc → UNIT #239; 1988-03-01 to 1999-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Lyle  Maschoff → W Hodgman & Sons Inc; 1988-03-01 to 1999-01-13; source msha-controller-operator-history
- **operator_operates_mine:** W Hodgman & Sons Inc → UNIT #239; 1999-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Alber  et al → UNIT #239; 1999-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Alber  et al → W Hodgman & Sons Inc; 1999-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Roudebush  et al → W Hodgman & Sons Inc; 1999-01-14 to current/open; source msha-controller-operator-history