# Relationship history for MSHA mine 3002345

Current hierarchy: **Perkins Floyd → Floyd Perkins → Perkins 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Minerva Highway Department → Perkins Pit; 1979-01-01 to 1981-10-19; source msha-controller-operator-history
- **controller_controls_mine:** City Of Minerva → Perkins Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** City Of Minerva → Minerva Highway Department; 1979-01-01 to 1981-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Floyd Perkins → Perkins Pit; 1981-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Perkins Floyd → Perkins Pit; 1981-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Perkins Floyd → Floyd Perkins; 1981-10-20 to current/open; source msha-controller-operator-history