# Relationship history for MSHA mine 4102914

Current hierarchy: **Beets Bill R → Base Materials Inc → Leyendecker Pit**

- 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

- **controller_controls_mine:** Timothy D  Word et al → Leyendecker Pit; 1978-09-01 to 2019-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Dean Word Company → Leyendecker Pit; 1979-08-01 to 1988-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Timothy D  Word et al → Dean Word Company; 1979-08-01 to 1988-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Base Materials Inc → Leyendecker Pit; 1988-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Beets Bill R → Leyendecker Pit; 1988-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beets Bill R → Base Materials Inc; 1988-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Forrest  Word et al → Leyendecker Pit; 2019-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Forrest  Word et al → Dean Word Company; 2019-04-01 to 1988-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Suzanne  Word et al → Dean Word Company; 2019-04-01 to 1988-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Bryan  Word et al → Dean Word Company; 2019-04-01 to 1988-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Timothy Dean Word III et al → Dean Word Company; 2019-04-01 to 1988-11-14; source msha-controller-operator-history