# Relationship history for MSHA mine 1505162

Current hierarchy: **Moodie Boyce → Triple M Mining Corp → Babb Barnes**

- 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

- **operator_operates_mine:** Frontier Spar Corp → Babb Barnes; 1950-01-01 to 1987-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Marathon Oil Company → Babb Barnes; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marathon Oil Company → Frontier Spar Corp; 1950-01-01 to 1987-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Illinois Fluorspar Corp → Babb Barnes; 1987-12-23 to 1990-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Diversified Minerals → Babb Barnes; 1987-12-23 to 1990-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Diversified Minerals → Kentucky Illinois Fluorspar Corp; 1987-12-23 to 1990-03-05; source msha-controller-operator-history
- **operator_operates_mine:** Triple M Mining Corp → Babb Barnes; 1990-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moodie Boyce → Babb Barnes; 1990-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moodie Boyce → Triple M Mining Corp; 1990-03-06 to current/open; source msha-controller-operator-history