# Relationship history for MSHA mine 4001630

Current hierarchy: **Bass J M Jr → Little T Coal Inc → No 1 A 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

- **operator_operates_mine:** Little T Coal Company Inc → No 1 A Mine; 1974-10-06 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Lowe James E → No 1 A Mine; 1974-10-06 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Lowe James E → Little T Coal Company Inc; 1974-10-06 to 1978-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Little T Coal Inc → No 1 A Mine; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bass J M Jr → No 1 A Mine; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bass J M Jr → Little T Coal Inc; 1978-12-01 to current/open; source msha-controller-operator-history