# Relationship history for MSHA mine 2401306

Current hierarchy: **Craig  Hanson; James  Rohrer → Conrad Sand & Gravel Redi-Mix Inc → Conrad Sand & Gravel Redi-Mix Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Conrad Sand & Gravel → Conrad Sand & Gravel Redi-Mix Inc; 1950-01-01 to 1983-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Rohrer Arnold → Conrad Sand & Gravel Redi-Mix Inc; 1950-01-01 to 1983-03-28; source msha-controller-operator-history
- **controller_controls_operator:** Rohrer Arnold → Conrad Sand & Gravel; 1950-01-01 to 1983-03-28; source msha-controller-operator-history
- **operator_operates_mine:** Conrad Sand & Gravel Redi-Mix Inc → Conrad Sand & Gravel Redi-Mix Inc; 1983-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Rohrer  et al → Conrad Sand & Gravel Redi-Mix Inc; 1983-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Rohrer  et al → Conrad Sand & Gravel Redi-Mix Inc; 1983-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  Hanson  et al → Conrad Sand & Gravel Redi-Mix Inc; 1983-03-29 to current/open; source msha-controller-operator-history