# Relationship history for MSHA mine 2101494

Current hierarchy: **Rajala Thomas E → Rajala Construction Company Inc → Mattson Deep Lake Pit & Mill**

- 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:** Mattson Excavators Inc → Mattson Deep Lake Pit & Mill; 1950-01-01 to 1980-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Mattson Warner → Mattson Deep Lake Pit & Mill; 1950-01-01 to 1980-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Mattson Warner → Mattson Excavators Inc; 1950-01-01 to 1980-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Rajala Thomas E → Mattson Deep Lake Pit & Mill; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rajala Construction Company Inc → Mattson Deep Lake Pit & Mill; 1980-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rajala Thomas E → Rajala Construction Company Inc; 1980-07-30 to current/open; source msha-controller-operator-history