# Relationship history for MSHA mine 1516053

Current hierarchy: **Nicewonder J D - R L Wallen → Cave Branch Mining Inc → Cave Branch Strip**

- 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:** Cave Branch Mining Inc → Cave Branch Strip; 1987-05-01 to 1989-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Ison → Cave Branch Strip; 1987-05-01 to 1989-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Ison → Cave Branch Mining Inc; 1987-05-01 to 1989-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Cave Branch Mining Inc → Cave Branch Strip; 1989-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nicewonder J D - R L Wallen Et Al → Cave Branch Strip; 1989-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicewonder J D - R L Wallen Et Al → Cave Branch Mining Inc; 1989-04-03 to current/open; source msha-controller-operator-history