# Relationship history for MSHA mine 0401614

Current hierarchy: **Thomas A Staben → Pacific Rock Inc → Pacific Rock Inc**

- 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:** L S Hawley Corp → Pacific Rock Inc; 1950-01-01 to 1986-01-20; source msha-controller-operator-history
- **controller_controls_mine:** L D  Hawley → Pacific Rock Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L D  Hawley → L S Hawley Corp; 1950-01-01 to 1986-01-20; source msha-controller-operator-history
- **operator_operates_mine:** A J Sanders → Pacific Rock Inc; 1986-01-21 to 2001-03-02; source msha-controller-operator-history
- **controller_controls_mine:** A J  Sanders et al → Pacific Rock Inc; 1986-01-21 to 2001-03-02; source msha-controller-operator-history
- **controller_controls_operator:** A J  Sanders et al → A J Sanders; 1986-01-21 to 2001-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Pacific Rock Inc → Pacific Rock Inc; 2001-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Yurosek Bob → Pacific Rock Inc; 2001-03-03 to 2003-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Yurosek Bob → Pacific Rock Inc; 2001-03-03 to 2003-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Thomas A Staben → Pacific Rock Inc; 2003-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A Staben → Pacific Rock Inc; 2003-11-10 to current/open; source msha-controller-operator-history