# Relationship history for MSHA mine 1517857

Current hierarchy: **Gwenda L  Sellers; Eddie D  Tapp → T & T Washing Company Inc → T&T Washing Co Inc**

- 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

- **operator_operates_mine:** T & T Washing Company Inc → T&T Washing Co Inc; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gwenda L  Sellers Et Al → T&T Washing Co Inc; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gwenda L  Sellers Et Al → T & T Washing Company Inc; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eddie D  Tapp et al → T & T Washing Company Inc; 1996-10-01 to current/open; source msha-controller-operator-history