# Relationship history for MSHA mine 4102899

Current hierarchy: **Polasek David G → Polasek Sand & Gravel Inc → Polasek Sand & Gravel Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Fayette County Mining Company → Polasek Sand & Gravel Incorporated; 1979-01-01 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Mc Aninch Bill-Joe H Counts Et Al → Polasek Sand & Gravel Incorporated; 1979-01-01 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Mc Aninch Bill-Joe H Counts Et Al → Fayette County Mining Company; 1979-01-01 to 1988-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Polasek Sand & Gravel Inc → Polasek Sand & Gravel Incorporated; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Polasek David G → Polasek Sand & Gravel Incorporated; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Polasek David G → Polasek Sand & Gravel Inc; 1988-10-01 to current/open; source msha-controller-operator-history