# Relationship history for MSHA mine 3500730

Current hierarchy: **Funk Dennis M & M Mike Carver → 101 Sand & Gravel → 101 Sand & Gravel Pit & Plant**

- 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

- **operator_operates_mine:** Jarvis Sand & Gravel Company → 101 Sand & Gravel Pit & Plant; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Jarvis Sand & Gravel Company → 101 Sand & Gravel Pit & Plant; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Jarvis Sand & Gravel Company → Jarvis Sand & Gravel Company; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **operator_operates_mine:** 101 Sand & Gravel → 101 Sand & Gravel Pit & Plant; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Funk Dennis M & M Mike Carver → 101 Sand & Gravel Pit & Plant; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Funk Dennis M & M Mike Carver → 101 Sand & Gravel; 1979-04-01 to current/open; source msha-controller-operator-history