# Relationship history for MSHA mine 1507630

Current hierarchy: **Salyers Gene & William Stiltner → Stiltner & Salyers Coal Company → No 1-E 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Grassy Fork Coal Company → No 1-E Mine; 1974-10-22 to 1981-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Cox William A → No 1-E Mine; 1974-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cox William A → Grassy Fork Coal Company; 1974-10-22 to 1981-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Gene & William Stiltner → No 1-E Mine; 1977-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stiltner & Salyers Coal Company → No 1-E Mine; 1981-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Gene & William Stiltner → Stiltner & Salyers Coal Company; 1981-07-22 to current/open; source msha-controller-operator-history