# Relationship history for MSHA mine 1700967

Current hierarchy: **Tyler  Gardner; Shey  Gardner; Thomas W Gardner → W. T. Gardner & Sons, Inc. → Chip Mill 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:** W. T. Gardner & Sons, Inc. → Chip Mill Pit; 2015-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott A  Gardner et al → Chip Mill Pit; 2015-10-07 to 2025-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Scott A  Gardner et al → W. T. Gardner & Sons, Inc.; 2015-10-07 to 2025-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W  Gardner et al → W. T. Gardner & Sons, Inc.; 2015-10-07 to 2025-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Shey  Gardner et al → Chip Mill Pit; 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shey  Gardner et al → W. T. Gardner & Sons, Inc.; 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W Gardner et al → W. T. Gardner & Sons, Inc.; 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyler  Gardner et al → W. T. Gardner & Sons, Inc.; 2025-06-25 to current/open; source msha-controller-operator-history