# Relationship history for MSHA mine 1507480

Current hierarchy: **Mc Lain Donald → Fossil Fuels Coal 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:** Benjamin R.  Bennett → No 2 Mine; 1973-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Rock Mining Company → No 2 Mine; 1974-11-01 to 1978-09-05; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → Little Rock Mining Company; 1974-11-01 to 1978-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Mc Lain Donald → No 2 Mine; 1977-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fossil Fuels Coal Company → No 2 Mine; 1978-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Lain Donald → Fossil Fuels Coal Company; 1978-09-06 to current/open; source msha-controller-operator-history