# Relationship history for MSHA mine 3301538

Current hierarchy: **Carl (William)  Clemson → Kinsman Materials → Kinsman Materials**

- 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:** Kinsman Sand & Gravel Company → Kinsman Materials; 1950-01-01 to 2001-07-30; source msha-controller-operator-history
- **controller_controls_mine:** G B  Harnett → Kinsman Materials; 1950-01-01 to 2001-07-30; source msha-controller-operator-history
- **controller_controls_operator:** G B  Harnett → Kinsman Sand & Gravel Company; 1950-01-01 to 2001-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Kinsman Materials → Kinsman Materials; 2001-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl (William)  Clemson → Kinsman Materials; 2001-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl (William)  Clemson → Kinsman Materials; 2001-07-31 to current/open; source msha-controller-operator-history