# Relationship history for MSHA mine 3003043

Current hierarchy: **William C First → Keil Construction Corp → BJD DEVELOPMENT CORP.**

- 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:** Keil Construction Corp → BJD DEVELOPMENT CORP.; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William C First → BJD DEVELOPMENT CORP.; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William C First → Keil Construction Corp; 1992-06-01 to current/open; source msha-controller-operator-history