# Relationship history for MSHA mine 1101107

Current hierarchy: **Jonnie  Fritz → Quality Sand & Gravel → QUALITY SAND & 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:** George M Hansen Sand & Gravel Company → QUALITY SAND & GRAVEL; 1950-01-01 to 1979-06-13; source msha-controller-operator-history
- **controller_controls_mine:** George M  Hansen → QUALITY SAND & GRAVEL; 1950-01-01 to 1979-06-13; source msha-controller-operator-history
- **controller_controls_operator:** George M  Hansen → George M Hansen Sand & Gravel Company; 1950-01-01 to 1979-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Geldean & Hansen Inc → QUALITY SAND & GRAVEL; 1979-06-14 to 1986-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Robert S  Geldean → QUALITY SAND & GRAVEL; 1979-06-14 to 1986-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Robert S  Geldean → Geldean & Hansen Inc; 1979-06-14 to 1986-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Clear Lake Quarry → QUALITY SAND & GRAVEL; 1986-08-07 to 1989-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Van Herzeele → QUALITY SAND & GRAVEL; 1986-08-07 to 1989-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Van Herzeele → Clear Lake Quarry; 1986-08-07 to 1989-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Quality Sand & Gravel → QUALITY SAND & GRAVEL; 1989-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jonnie  Fritz → QUALITY SAND & GRAVEL; 1989-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonnie  Fritz → Quality Sand & Gravel; 1989-05-22 to current/open; source msha-controller-operator-history