# Relationship history for MSHA mine 1518391

Current hierarchy: **J Mark  Campbell → C.  W.  Augering Inc → No 3**

- 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:** James H  Booth et al → No 3; 2000-08-30 to 2019-06-15; source msha-controller-operator-history
- **operator_operates_mine:** C.  W.  Augering Inc → No 3; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James H  Booth et al → C.  W.  Augering Inc; 2001-06-01 to 2019-06-15; source msha-controller-operator-history
- **controller_controls_mine:** J Mark  Campbell → No 3; 2019-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Mark  Campbell → C.  W.  Augering Inc; 2019-06-16 to current/open; source msha-controller-operator-history