# Relationship history for MSHA mine 3000986

Current hierarchy: **Bovzas Jose M Lema → Mongaup Valley Sand & Gravel Inc → Mongaup Valley Sand & Gravel Incorporate**

- 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:** Valley Sand & Gravel Company → Mongaup Valley Sand & Gravel Incorporate; 1950-01-01 to 1988-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Tufano Nunzi & Joseph → Mongaup Valley Sand & Gravel Incorporate; 1950-01-01 to 1988-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Tufano Nunzi & Joseph → Valley Sand & Gravel Company; 1950-01-01 to 1988-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Mongaup Valley Sand & Gravel Inc → Mongaup Valley Sand & Gravel Incorporate; 1988-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bovzas Jose M Lema → Mongaup Valley Sand & Gravel Incorporate; 1988-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bovzas Jose M Lema → Mongaup Valley Sand & Gravel Inc; 1988-05-12 to current/open; source msha-controller-operator-history