# Relationship history for MSHA mine 3606406

Current hierarchy: **John L  Popple → John Popple Trucking Company → East Side Sand And Gravel Company**

- 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:** John Popple Trucking Company → East Side Sand And Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John L  Popple → East Side Sand And Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Popple → John Popple Trucking Company; 1950-01-01 to current/open; source msha-controller-operator-history