# Relationship history for MSHA mine 3102005

Current hierarchy: **Harrell Mike → Roanoke Sand & Gravel → Harrell Mine**

- 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:** Roanoke Sand & Gravel → Harrell Mine; 1987-06-01 to 1988-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Harrison Ronald → Harrell Mine; 1987-06-01 to 1988-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Harrison Ronald → Roanoke Sand & Gravel; 1987-06-01 to 1988-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Roanoke Sand & Gravel → Harrell Mine; 1988-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harrell Mike Et Al → Harrell Mine; 1988-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harrell Mike Et Al → Roanoke Sand & Gravel; 1988-06-25 to current/open; source msha-controller-operator-history