# Relationship history for MSHA mine 1601103

Current hierarchy: **Spell Mavis M → Spell Trucking Inc → Spell Pit #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

- **controller_controls_mine:** Spell Mavis M → Spell Pit #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hunt Sand & Gravel → Spell Pit #2; 1986-06-01 to 1990-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Hunt → Spell Pit #2; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Hunt → Hunt Sand & Gravel; 1986-06-01 to 1990-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Spell Trucking Inc → Spell Pit #2; 1990-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spell Mavis M → Spell Trucking Inc; 1990-08-15 to current/open; source msha-controller-operator-history