# Relationship history for MSHA mine 1600972

Current hierarchy: **Spell Mavis M → Spell Trucking Inc → Enon 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

- **controller_controls_mine:** Spell Mavis M → Enon Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M Hunt Company → Enon Pit; 1980-01-01 to 1981-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Malachi → Enon Pit; 1980-01-01 to 1981-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Malachi → M Hunt Company; 1980-01-01 to 1981-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Roy Hunt Sand & Gravel → Enon Pit; 1981-01-26 to 1981-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Hunt → Enon Pit; 1981-01-26 to 1981-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Hunt → Roy Hunt Sand & Gravel; 1981-01-26 to 1981-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Spell Trucking Inc → Enon Pit; 1981-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spell Mavis M → Spell Trucking Inc; 1981-05-05 to current/open; source msha-controller-operator-history