# Relationship history for MSHA mine 1401419

Current hierarchy: **Rodney  Killian → Southwest Sand Company → SOUTHWEST CO**

- 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:** Southwest Sand & Gravel → SOUTHWEST CO; 1982-11-01 to 1989-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Killian Rodney & Larry Kerbs → SOUTHWEST CO; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Killian Rodney & Larry Kerbs → Southwest Sand & Gravel; 1982-11-01 to 1989-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Sand Company → SOUTHWEST CO; 1989-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rodney  Killian → SOUTHWEST CO; 1989-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney  Killian → Southwest Sand Company; 1989-04-28 to current/open; source msha-controller-operator-history