# Relationship history for MSHA mine 1513170

Current hierarchy: **Seals Cecil → Cecil & Bob Coal Company Inc → No 1 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

- **controller_controls_mine:** Vandagriff Glen Doil → No 1 Mine; 1981-02-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shelia Coal Company Inc → No 1 Mine; 1981-10-01 to 1982-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Fee Kernie → No 1 Mine; 1981-10-01 to 1982-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Fee Kernie → Shelia Coal Company Inc; 1981-10-01 to 1982-04-22; source msha-controller-operator-history
- **operator_operates_mine:** G V Coal Company → No 1 Mine; 1982-04-23 to 1982-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Vandagriff Glen Doil → G V Coal Company; 1982-04-23 to 1982-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Cecil & Bob Coal Company Inc → No 1 Mine; 1982-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Seals Cecil → No 1 Mine; 1982-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Seals Cecil → Cecil & Bob Coal Company Inc; 1982-08-27 to current/open; source msha-controller-operator-history