# Relationship history for MSHA mine 1701175

Current hierarchy: **Everett  Grindle; Spencer  Grindle; Scott  Grindle → E. Skip Grindle & Sons, Inc. → Patriot Road Pit**

- 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:** E. Skip Grindle & Sons, Inc. → Patriot Road Pit; 2026-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spencer  Grindle et al → Patriot Road Pit; 2026-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spencer  Grindle et al → E. Skip Grindle & Sons, Inc.; 2026-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Everett  Grindle et al → E. Skip Grindle & Sons, Inc.; 2026-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Grindle et al → E. Skip Grindle & Sons, Inc.; 2026-03-30 to current/open; source msha-controller-operator-history