# Relationship history for MSHA mine 4404955

Current hierarchy: **Webb Johnny → Traci Leigh 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Braniff Coal Corp → No 1 Mine; 1978-02-01 to 1981-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Osborne Jr → No 1 Mine; 1978-02-01 to 1981-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Osborne Jr → Braniff Coal Corp; 1978-02-01 to 1981-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Per Don Coal Company Inc → No 1 Mine; 1981-04-14 to 1981-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Matney Perry & Donald → No 1 Mine; 1981-04-14 to 1981-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Matney Perry & Donald → Per Don Coal Company Inc; 1981-04-14 to 1981-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Traci Leigh Coal Company Inc → No 1 Mine; 1981-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Webb Johnny → No 1 Mine; 1981-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webb Johnny → Traci Leigh Coal Company Inc; 1981-08-24 to current/open; source msha-controller-operator-history