# Relationship history for MSHA mine 3200489

Current hierarchy: **Carow Robert & Robin → Carow Sand & Gravel → Carow Sand And Gravel**

- 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

- **operator_operates_mine:** Mickelson Sand & Gravel → Carow Sand And Gravel; 1978-03-01 to 1979-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Mickelson Johnnie → Carow Sand And Gravel; 1978-03-01 to 1979-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Mickelson Johnnie → Mickelson Sand & Gravel; 1978-03-01 to 1979-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Carow Sand & Gravel → Carow Sand And Gravel; 1979-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carow Robert & Robin → Carow Sand And Gravel; 1979-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carow Robert & Robin → Carow Sand & Gravel; 1979-05-24 to current/open; source msha-controller-operator-history