# Relationship history for MSHA mine 0800923

Current hierarchy: **Gillman Ronald C → Monroe Quarries Inc → Long Key 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:** Cothron Alonzo → Long Key Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alonzo Cothron Inc → Long Key Pit; 1979-01-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Cothron Alonzo → Alonzo Cothron Inc; 1979-01-01 to 1986-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Monroe Quarries Inc → Long Key Pit; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gillman Ronald C Et Al → Long Key Pit; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gillman Ronald C Et Al → Monroe Quarries Inc; 1986-05-01 to current/open; source msha-controller-operator-history