# Relationship history for MSHA mine 3304206

Current hierarchy: **Mark  Williams → Mark Williams Blacktop Company Inc → MARK WILLIAMS BLACKTOP CO., INC.**

- 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:** Mark Williams Blacktop Company Inc → MARK WILLIAMS BLACKTOP CO., INC.; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Williams → MARK WILLIAMS BLACKTOP CO., INC.; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Williams → Mark Williams Blacktop Company Inc; 1990-06-01 to current/open; source msha-controller-operator-history