# Relationship history for MSHA mine 0102987

Current hierarchy: **Samuel W  Hyatt → S & T Sand & Gravel Inc → Sims 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

- **controller_controls_mine:** Randall Jason Hyatt → Sims Pit; 1991-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hyatt Sand & Gravel → Sims Pit; 1993-04-01 to 1993-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Randall Jason Hyatt → Hyatt Sand & Gravel; 1993-04-01 to 1993-07-15; source msha-controller-operator-history
- **operator_operates_mine:** S & T Sand & Gravel Inc → Sims Pit; 1993-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Samuel W  Hyatt → Sims Pit; 1993-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel W  Hyatt → S & T Sand & Gravel Inc; 1993-07-16 to current/open; source msha-controller-operator-history