# Relationship history for MSHA mine 4002410

Current hierarchy: **Schroeder Vernon → Little Mountain Coal Company Inc → No 1**

- 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:** Empty Pocket Coal Company → No 1; 1978-04-01 to 1979-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Stockwell Robert B → No 1; 1978-04-01 to 1979-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Stockwell Robert B → Empty Pocket Coal Company; 1978-04-01 to 1979-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Little Mountain Coal Company Inc → No 1; 1979-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schroeder Vernon → No 1; 1979-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schroeder Vernon → Little Mountain Coal Company Inc; 1979-02-28 to current/open; source msha-controller-operator-history