# Relationship history for MSHA mine 3401227

Current hierarchy: **Remple Jim → L & R Sand & Gravel → L And R 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Doug Hayes Sand & Gravel → L And R Sand And Gravel; 1979-01-01 to 1980-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Hayes Doug → L And R Sand And Gravel; 1979-01-01 to 1980-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Hayes Doug → Doug Hayes Sand & Gravel; 1979-01-01 to 1980-10-29; source msha-controller-operator-history
- **operator_operates_mine:** L & R Sand & Gravel → L And R Sand And Gravel; 1980-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Remple Jim → L And R Sand And Gravel; 1980-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Remple Jim → L & R Sand & Gravel; 1980-10-30 to current/open; source msha-controller-operator-history