# Relationship history for MSHA mine 2402777

Current hierarchy: **Daniel Warren  Kaylor; Tiffany  Kaylor → 212 Sand and Gravel Inc. → 212 Sand and Gravel**

- 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:** 212 Sand and Gravel Inc. → 212 Sand and Gravel; 2022-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aaron Kyle  Baranko et al → 212 Sand and Gravel; 2022-04-27 to 2022-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Aaron Kyle  Baranko et al → 212 Sand and Gravel Inc.; 2022-04-27 to 2022-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Warren  Kaylor et al → 212 Sand and Gravel Inc.; 2022-04-27 to 2022-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Tiffany  Kaylor et al → 212 Sand and Gravel; 2022-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tiffany  Kaylor et al → 212 Sand and Gravel Inc.; 2022-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Warren  Kaylor et al → 212 Sand and Gravel Inc.; 2022-06-01 to current/open; source msha-controller-operator-history