# Relationship history for MSHA mine 2200779

Current hierarchy: **Rogers Group Inc → Rogers Group, Inc → McPhail 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

- **controller_controls_mine:** Rogers Group Inc → McPhail Sand and Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & D Materials LLC → McPhail Sand and Gravel; 2008-11-11 to 2011-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Walter et al → McPhail Sand and Gravel; 2008-11-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Walter et al → L & D Materials LLC; 2008-11-11 to 2011-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Gowdy et al → L & D Materials LLC; 2008-11-11 to 2011-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group, Inc → McPhail Sand and Gravel; 2011-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group, Inc; 2011-02-15 to current/open; source msha-controller-operator-history