# Relationship history for MSHA mine 0301404

Current hierarchy: **Kail Floyd → Kail Construction Company Inc → Bartholamu Pit**

- 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

- **controller_controls_mine:** Kail Floyd → Bartholamu Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kail Construction Company Inc → Bartholamu Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kail Floyd → Kail Construction Company Inc; 1978-03-09 to current/open; source msha-controller-operator-history