# Relationship history for MSHA mine 1509994

Current hierarchy: **Willie  Blankenship → F & B Coal 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Taylor Carl H → No 1 Mine; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Star Lite Mining Inc → No 1 Mine; 1976-09-29 to 1977-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Carl H → Star Lite Mining Inc; 1976-09-29 to 1977-03-03; source msha-controller-operator-history
- **operator_operates_mine:** F & B Coal Inc → No 1 Mine; 1977-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Willie  Blankenship → No 1 Mine; 1977-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willie  Blankenship → F & B Coal Inc; 1977-03-04 to current/open; source msha-controller-operator-history