# Relationship history for MSHA mine 1201988

Current hierarchy: **Black Beauty Resources → Black Beauty Underground Inc → Apraw Underground 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:** Underground Coal Inc → Apraw Underground Mine; 1986-09-01 to 1991-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Shand Alexander (Holdings) Ltd → Apraw Underground Mine; 1986-09-01 to 1992-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Shand Alexander (Holdings) Ltd → Underground Coal Inc; 1986-09-01 to 1991-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Black Beauty Underground Inc → Apraw Underground Mine; 1991-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Black Beauty Resources → Apraw Underground Mine; 1991-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Black Beauty Resources → Black Beauty Underground Inc; 1991-08-20 to current/open; source msha-controller-operator-history