# Relationship history for MSHA mine 3500719

Current hierarchy: **Sloan Edward → Southern Oregon Concrete Ltd → Applegate Pit**

- 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:** Robert C Gilbert Company Inc → Applegate Pit; 1950-01-01 to 1978-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Gilbert Robert C → Applegate Pit; 1950-01-01 to 1979-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Gilbert Robert C → Robert C Gilbert Company Inc; 1950-01-01 to 1978-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Southern Oregon Concrete Inc → Applegate Pit; 1978-04-01 to 1983-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Bolch Kenneth → Applegate Pit; 1978-04-01 to 1983-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Bolch Kenneth → Southern Oregon Concrete Inc; 1978-04-01 to 1983-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Southern Oregon Concrete Ltd → Applegate Pit; 1983-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sloan Edward → Applegate Pit; 1983-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sloan Edward → Southern Oregon Concrete Ltd; 1983-06-08 to current/open; source msha-controller-operator-history