# Relationship history for MSHA mine 3100421

Current hierarchy: **Bob Ivey  Smith; Randall  Dawson → Gainey'S Sand & Gravel Company Inc → GAINEY'S 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:** Gainey Sand & Gravel Company Inc → GAINEY'S SAND & GRAVEL; 1950-01-01 to 1993-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Norwood  Gainey Jr → GAINEY'S SAND & GRAVEL; 1950-01-01 to 1993-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Norwood  Gainey Jr → Gainey Sand & Gravel Company Inc; 1950-01-01 to 1993-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Gainey'S Sand & Gravel Company Inc → GAINEY'S SAND & GRAVEL; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bob Ivey  Smith  et al → GAINEY'S SAND & GRAVEL; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob Ivey  Smith  et al → Gainey'S Sand & Gravel Company Inc; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall  Dawson  et al → Gainey'S Sand & Gravel Company Inc; 1993-04-01 to current/open; source msha-controller-operator-history