# Relationship history for MSHA mine 1510517

Current hierarchy: **Music Tom Ed → Scotch Coal Company Inc → No 1 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:** V & R Coal Company Inc → No 1 Mine; 1977-06-01 to 1977-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Runyon Bob → No 1 Mine; 1977-06-01 to 1977-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Runyon Bob → V & R Coal Company Inc; 1977-06-01 to 1977-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Scotch Coal Company Inc → No 1 Mine; 1977-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Music Tom Ed → No 1 Mine; 1977-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Music Tom Ed → Scotch Coal Company Inc; 1977-08-06 to current/open; source msha-controller-operator-history