# Relationship history for MSHA mine 3304464

Current hierarchy: **Rex  Maiden; Tim  Maiden → BT Materials Inc. → BT Materials 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:** BT Materials Inc. → BT Materials Inc.; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rex  Maiden  et al → BT Materials Inc.; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Maiden  et al → BT Materials Inc.; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Maiden  et al → BT Materials Inc.; 2000-06-01 to current/open; source msha-controller-operator-history