# Relationship history for MSHA mine 2700242

Current hierarchy: **Hoyt Albert → Al Hoyt & Sons Inc → Hoyt'S 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Al Hoyt & Sons Inc → Hoyt'S Pit; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hoyt Albert → Hoyt'S Pit; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoyt Albert → Al Hoyt & Sons Inc; 1981-09-01 to current/open; source msha-controller-operator-history