# Relationship history for MSHA mine 3401139

Current hierarchy: **Hurst Don W → Shawnee Paving Company → Shawnee Sand Company**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** E T (Buck) Madole → Shawnee Sand Company; 1978-03-09 to 1979-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Madole E T Buck → Shawnee Sand Company; 1978-03-09 to 1979-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Madole E T Buck → E T (Buck) Madole; 1978-03-09 to 1979-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Shawnee Paving Company → Shawnee Sand Company; 1979-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hurst Don W → Shawnee Sand Company; 1979-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hurst Don W → Shawnee Paving Company; 1979-03-26 to current/open; source msha-controller-operator-history