# Relationship history for MSHA mine 4102783

Current hierarchy: **Raymond Dvorak Trust; Doris  Dvorak → Texas Lumber & Construction Company → Texas Lumber & Construction Co**

- 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:** Seven Day Concrete Inc → Texas Lumber & Construction Co; 1978-03-09 to 1988-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Randolph W  Taylor et al → Texas Lumber & Construction Co; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randolph W  Taylor et al → Seven Day Concrete Inc; 1978-03-09 to 1988-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Texas Lumber & Construction Company → Texas Lumber & Construction Co; 1988-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond Dvorak Trust et al → Texas Lumber & Construction Co; 1988-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond Dvorak Trust et al → Texas Lumber & Construction Company; 1988-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doris  Dvorak et al → Texas Lumber & Construction Company; 1988-11-16 to current/open; source msha-controller-operator-history