# Relationship history for MSHA mine 4104352

Current hierarchy: **Vince  Lawrence → Cornerstone Materials → Blockhouse**

- 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:** Timberland Resources Inc. → Blockhouse; 2002-04-03 to 2006-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Cecil  Boulware → Blockhouse; 2002-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cecil  Boulware → Timberland Resources Inc.; 2002-04-03 to 2006-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Cornerstone Materials → Blockhouse; 2006-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vince  Lawrence  et al → Blockhouse; 2006-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vince  Lawrence  et al → Cornerstone Materials; 2006-04-18 to current/open; source msha-controller-operator-history