# Relationship history for MSHA mine 0300381

Current hierarchy: **Holland George → Holland Gravel Company Inc → Holland Gravel**

- 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:** Belvedere Sand & Gravel Company → Holland Gravel; 1950-01-01 to 1986-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Hastings Larry Jr & Dave Harris → Holland Gravel; 1950-01-01 to 1986-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Hastings Larry Jr & Dave Harris → Belvedere Sand & Gravel Company; 1950-01-01 to 1986-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Holland Gravel Company Inc → Holland Gravel; 1986-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holland George → Holland Gravel; 1986-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holland George → Holland Gravel Company Inc; 1986-11-17 to current/open; source msha-controller-operator-history