# Relationship history for MSHA mine 2002885

Current hierarchy: **David  Jonckheere → D & J Gravel Company Inc → CHILSON RD. 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

- **controller_controls_mine:** David  Jonckheere → CHILSON RD. PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mega Dirt Inc → CHILSON RD. PIT; 1992-09-01 to 1996-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Brown → CHILSON RD. PIT; 1992-09-01 to 1996-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Brown → Mega Dirt Inc; 1992-09-01 to 1996-12-11; source msha-controller-operator-history
- **operator_operates_mine:** D & J Gravel Company Inc → CHILSON RD. PIT; 1996-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Jonckheere → D & J Gravel Company Inc; 1996-12-12 to current/open; source msha-controller-operator-history