# Relationship history for MSHA mine 3607229

Current hierarchy: **Maurer Gilbert → 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:** Three L Coal Company → No 1 Slope; 1981-11-01 to 1982-06-02; source msha-controller-operator-history
- **controller_controls_mine:** James  Lenig → No 1 Slope; 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Lenig → Three L Coal Company; 1981-11-01 to 1982-06-02; source msha-controller-operator-history
- **operator_operates_mine:** L E D Coal Company → No 1 Slope; 1982-06-03 to 1983-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Long Edward P & Ulysses Et Al → No 1 Slope; 1982-06-03 to 1983-01-06; source msha-controller-operator-history
- **controller_controls_operator:** Long Edward P & Ulysses Et Al → L E D Coal Company; 1982-06-03 to 1983-01-06; source msha-controller-operator-history
- **operator_operates_mine:** Last Chance Coal Company → No 1 Slope; 1983-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maurer Gilbert Et Al → No 1 Slope; 1983-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maurer Gilbert Et Al → Last Chance Coal Company; 1983-01-07 to current/open; source msha-controller-operator-history