# Relationship history for MSHA mine 3503484

Current hierarchy: **Raymond L  Chard → Ray Chard Trucking & Excavating → RAY CHARD PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Ray Chard Trucking & Excavating → RAY CHARD PIT; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond L  Chard → RAY CHARD PIT; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond L  Chard → Ray Chard Trucking & Excavating; 1999-07-01 to current/open; source msha-controller-operator-history