# Relationship history for MSHA mine 3503266

Current hierarchy: **German Jerry → Southern Oregon Rock → Southern Oregon Portable**

- 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:** Klamath Pacific Corp → Southern Oregon Portable; 1986-07-01 to 1988-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Stewart → Southern Oregon Portable; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Stewart → Klamath Pacific Corp; 1986-07-01 to 1988-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Southern Oregon Rock → Southern Oregon Portable; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** German Jerry → Southern Oregon Portable; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** German Jerry → Southern Oregon Rock; 1988-03-01 to current/open; source msha-controller-operator-history