# Relationship history for MSHA mine 1201768

Current hierarchy: **Warren  Slider → E T Slider Company Inc → E T Slider Company**

- 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:** Warren  Slider → E T Slider Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lucas & Crumbo Sand & Gravel → E T Slider Company; 1980-01-01 to 1983-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Crumbo Chester W & David--George Lucas → E T Slider Company; 1980-01-01 to 1983-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Crumbo Chester W & David--George Lucas → Lucas & Crumbo Sand & Gravel; 1980-01-01 to 1983-08-03; source msha-controller-operator-history
- **operator_operates_mine:** E T Slider Company Inc → E T Slider Company; 1983-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren  Slider → E T Slider Company Inc; 1983-08-04 to current/open; source msha-controller-operator-history