# Relationship history for MSHA mine 0500914

Current hierarchy: **Bunker Phil → Phil Bunker Mining Company → Mineral Joe #2**

- 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:** Kelmine Corp → Mineral Joe #2; 1950-01-01 to 1982-12-23; source msha-controller-operator-history
- **controller_controls_mine:** Colorado Kenworth Inc → Mineral Joe #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colorado Kenworth Inc → Kelmine Corp; 1950-01-01 to 1982-12-23; source msha-controller-operator-history
- **operator_operates_mine:** Phil Bunker Mining Company → Mineral Joe #2; 1982-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bunker Phil → Mineral Joe #2; 1982-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bunker Phil → Phil Bunker Mining Company; 1982-12-24 to current/open; source msha-controller-operator-history