# Relationship history for MSHA mine 1515207

Current hierarchy: **Fisher Virgil Wayne → G & T Coal Corp → No 1**

- 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:** Bowling Edward → No 1; 1985-04-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Service Contractors Inc → No 1; 1985-05-01 to 1986-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Bowling Edward → Service Contractors Inc; 1985-05-01 to 1986-01-08; source msha-controller-operator-history
- **operator_operates_mine:** G & T Coal Corp → No 1; 1986-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fisher Virgil Wayne → No 1; 1986-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fisher Virgil Wayne → G & T Coal Corp; 1986-01-09 to current/open; source msha-controller-operator-history