# Relationship history for MSHA mine 1510901

Current hierarchy: **Williams Garry L → Quality Fuels Limited → No 3 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:** Seals Frank → No 3 Mine; 1970-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams Garry L → No 3 Mine; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seals Coal Co Inc → No 3 Mine; 1977-10-01 to 1978-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Seals Frank → Seals Coal Co Inc; 1977-10-01 to 1978-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Quality Fuels Limited → No 3 Mine; 1978-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Garry L → Quality Fuels Limited; 1978-12-12 to current/open; source msha-controller-operator-history