# Relationship history for MSHA mine 1507381

Current hierarchy: **Hylton Freddie A → Hellier Fuel Company → No 2 Mine**

- 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:** Rowe Marlin → No 2 Mine; 1950-01-01 to 1980-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Hellier Fuel Company → No 2 Mine; 1974-10-07 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Rowe Marlin → Hellier Fuel Company; 1974-10-07 to 1980-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Hellier Fuel Company → No 2 Mine; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hylton Freddie A → No 2 Mine; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hylton Freddie A → Hellier Fuel Company; 1980-02-01 to current/open; source msha-controller-operator-history