# Relationship history for MSHA mine 1102967

Current hierarchy: **VOTORANTIM CIMENTOS → VCNA Prairie LLC → Byron West-Limestone**

- 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:** Toby A  Rogers Et Al → Byron West-Limestone; 1989-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Ready Mix & Materials Inc → Byron West-Limestone; 1994-09-01 to 2025-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Toby A  Rogers Et Al → Rogers Ready Mix & Materials Inc; 1994-09-01 to 2025-05-27; source msha-controller-operator-history
- **controller_controls_mine:** VOTORANTIM CIMENTOS → Byron West-Limestone; 2008-02-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** VCNA Prairie LLC → Byron West-Limestone; 2025-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** VOTORANTIM CIMENTOS → VCNA Prairie LLC; 2025-05-28 to current/open; source msha-controller-operator-history