# Relationship history for MSHA mine 3503370

Current hierarchy: **CRH PLC → Klamath Pacific Company → KP Portable Crusher**

- 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:** CRH PLC → KP Portable Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Stewart → KP Portable Crusher; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Klamath Pacific Corp → KP Portable Crusher; 1992-03-01 to 2005-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Stewart → Klamath Pacific Corp; 1992-03-01 to 2005-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Klamath Pacific Co. → KP Portable Crusher; 2005-01-31 to 2007-02-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → KP Portable Crusher; 2005-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Klamath Pacific Co.; 2005-01-31 to 2007-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Klamath Pacific Company → KP Portable Crusher; 2007-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Klamath Pacific Company; 2007-02-13 to current/open; source msha-controller-operator-history