# Relationship history for MSHA mine 0600274

Current hierarchy: **Linda  Adelman → Adelman Sand and Gravel → Adelman Sand & Gravel Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Seymour'S Sand & Stone Inc → Adelman Sand & Gravel Inc; 1950-01-01 to 1999-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Seymour  Adelman → Adelman Sand & Gravel Inc; 1950-01-01 to 1999-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Seymour  Adelman → Seymour'S Sand & Stone Inc; 1950-01-01 to 1999-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Adelman Sand and Gravel → Adelman Sand & Gravel Inc; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Linda  Adelman → Adelman Sand & Gravel Inc; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda  Adelman → Adelman Sand and Gravel; 1999-04-01 to current/open; source msha-controller-operator-history