# Relationship history for MSHA mine 3607685

Current hierarchy: **Lytle William F Jr → Last Chance Coal Company → No 1 Slope**

- 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:** Last Chance Coal Company → No 1 Slope; 1985-05-01 to 1986-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Shevitski James T Et Al → No 1 Slope; 1985-05-01 to 1986-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Shevitski James T Et Al → Last Chance Coal Company; 1985-05-01 to 1986-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Last Chance Coal Company → No 1 Slope; 1986-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lytle William F Jr Et Al → No 1 Slope; 1986-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lytle William F Jr Et Al → Last Chance Coal Company; 1986-04-17 to current/open; source msha-controller-operator-history