# Relationship history for MSHA mine 4607205

Current hierarchy: **Morgan Rush Glenn → General Safety Service Inc → Roy Thomas 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:** Kesselring Mining Company Inc → Roy Thomas Mine; 1986-09-01 to 1994-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Imperial-Pacific Investments Inc → Roy Thomas Mine; 1986-09-01 to 1994-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Imperial-Pacific Investments Inc → Kesselring Mining Company Inc; 1986-09-01 to 1994-09-07; source msha-controller-operator-history
- **operator_operates_mine:** General Safety Service Inc → Roy Thomas Mine; 1994-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morgan Rush Glenn → Roy Thomas Mine; 1994-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Rush Glenn → General Safety Service Inc; 1994-09-08 to current/open; source msha-controller-operator-history