# Relationship history for MSHA mine 0103040

Current hierarchy: **RMC Group PLC → Ewell Industries Inc → EWELL INDUSTRIES INC. DAWSON 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

- **controller_controls_mine:** Samuel W  Hyatt → EWELL INDUSTRIES INC. DAWSON PIT; 1993-07-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & T Sand & Gravel Inc → EWELL INDUSTRIES INC. DAWSON PIT; 1995-04-01 to 1998-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Samuel W  Hyatt → S & T Sand & Gravel Inc; 1995-04-01 to 1998-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Ewell Industries Inc → EWELL INDUSTRIES INC. DAWSON PIT; 1998-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** RMC Group PLC → EWELL INDUSTRIES INC. DAWSON PIT; 1998-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → Ewell Industries Inc; 1998-05-21 to current/open; source msha-controller-operator-history