# Relationship history for MSHA mine 0404840

Current hierarchy: **Cleland George → California Sand & Gravel → California 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:** North County Sand & Gravel Inc → California Sand And Gravel; 1986-11-01 to 1988-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Mike J  LaPaglia → California Sand And Gravel; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike J  LaPaglia → North County Sand & Gravel Inc; 1986-11-01 to 1988-08-22; source msha-controller-operator-history
- **operator_operates_mine:** California Sand & Gravel → California Sand And Gravel; 1988-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cleland George → California Sand And Gravel; 1988-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cleland George → California Sand & Gravel; 1988-08-23 to current/open; source msha-controller-operator-history