# Relationship history for MSHA mine 4503688

Current hierarchy: **Frank J Motley → JK Crushing LLC → Portable 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Mark  Cochran → Portable 2; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shawnee Rock Inc → Portable 2; 2011-02-28 to 2023-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Cochran → Shawnee Rock Inc; 2011-02-28 to 2023-06-05; source msha-controller-operator-history
- **operator_operates_mine:** JK Crushing LLC → Portable 2; 2023-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank J Motley → Portable 2; 2023-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J Motley → JK Crushing LLC; 2023-06-06 to current/open; source msha-controller-operator-history