# Relationship history for MSHA mine 3301682

Current hierarchy: **Shelly & Sands Inc → S & S Aggregate → S & S Aggregate**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Shelly & Sands Inc → S & S Aggregate; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Twin Lakes Sand Inc → S & S Aggregate; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_mine:** H J  Stager → S & S Aggregate; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H J  Stager → Twin Lakes Sand Inc; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **operator_operates_mine:** S & S Aggregate → S & S Aggregate; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shelly & Sands Inc → S & S Aggregate; 1986-06-01 to current/open; source msha-controller-operator-history