# Relationship history for MSHA mine 0202812

Current hierarchy: **Harvey H  Lundershausen → Continental Golf & Construction → SAND AND GRAVEL PRODUCTS PORTABL**

- 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:** Continental Golf & Construction → SAND AND GRAVEL PRODUCTS PORTABL; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harvey H  Lundershausen → SAND AND GRAVEL PRODUCTS PORTABL; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvey H  Lundershausen → Continental Golf & Construction; 1999-04-01 to current/open; source msha-controller-operator-history