# Relationship history for MSHA mine 4102768

Current hierarchy: **Bsi-Western Industries Inc → West Belt Development → West Belt Development**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Pendley H L → West Belt Development; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H L Pendley Company → West Belt Development; 1978-03-09 to 1988-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Pendley H L → H L Pendley Company; 1978-03-09 to 1988-10-25; source msha-controller-operator-history
- **operator_operates_mine:** West Belt Development → West Belt Development; 1988-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bsi-Western Industries Inc → West Belt Development; 1988-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bsi-Western Industries Inc → West Belt Development; 1988-10-26 to current/open; source msha-controller-operator-history