# Relationship history for MSHA mine 3503325

Current hierarchy: **Jamie H  Jackson → Rocky Mountain Construction → Portable #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:** CRH PLC → Portable #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Stewart → Portable #3; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Klamath Pacific Corp → Portable #3; 1988-12-01 to 2005-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Stewart → Klamath Pacific Corp; 1988-12-01 to 2005-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Klamath Pacific Company → Portable #3; 2005-01-31 to 2007-02-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Portable #3; 2005-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Klamath Pacific Company; 2005-01-31 to 2007-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Klamath Pacific Company → Portable #3; 2007-02-13 to 2014-06-25; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Klamath Pacific Company; 2007-02-13 to 2014-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Jamie H  Jackson et al → Portable #3; 2008-06-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Mountain Construction → Portable #3; 2014-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamie H  Jackson et al → Rocky Mountain Construction; 2014-06-26 to current/open; source msha-controller-operator-history