# Relationship history for MSHA mine 3605423

Current hierarchy: **Derck Randall → Big L 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:** Big L Coal Company → No 1 Slope; 1950-01-01 to 1979-11-05; source msha-controller-operator-history
- **controller_controls_mine:** James  Lenig → No 1 Slope; 1950-01-01 to 1979-11-05; source msha-controller-operator-history
- **controller_controls_operator:** James  Lenig → Big L Coal Company; 1950-01-01 to 1979-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Big L Coal Company → No 1 Slope; 1979-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derck Randall Et Al → No 1 Slope; 1979-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derck Randall Et Al → Big L Coal Company; 1979-11-06 to current/open; source msha-controller-operator-history