# Relationship history for MSHA mine 0800943

Current hierarchy: **Ronald M  Bergeron Sr → Bergeron Sand & Rock Mining Inc → Ponderosa 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:** Ronald M  Bergeron Sr → Ponderosa Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bergeron Sand & Rock Mining Inc → Ponderosa Pit; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald M  Bergeron Sr → Bergeron Sand & Rock Mining Inc; 1980-03-01 to current/open; source msha-controller-operator-history