# Relationship history for MSHA mine 4002768

Current hierarchy: **Talkington Harry W Sr → Talkington Mining Corp → E T R No 4**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Talkington Harry W Sr → E T R No 4; 1981-06-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E T R Mining Company Inc → E T R No 4; 1982-01-01 to 1983-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Dupre Gail F → E T R No 4; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dupre Gail F → E T R Mining Company Inc; 1982-01-01 to 1983-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Talkington Mining Corp → E T R No 4; 1983-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Talkington Harry W Sr → Talkington Mining Corp; 1983-04-13 to current/open; source msha-controller-operator-history