# Relationship history for MSHA mine 3400562

Current hierarchy: **Kenneth K  Wert → General Materials Inc → SOONER ROAD PIT**

- 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

- **operator_operates_mine:** Four Star Sand Company → SOONER ROAD PIT; 1950-01-01 to 1984-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Nolen → SOONER ROAD PIT; 1950-01-01 to 1984-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Nolen → Four Star Sand Company; 1950-01-01 to 1984-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Larry H  Lemon  et al → SOONER ROAD PIT; 1979-05-01 to 2009-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Quality Sand & Gravel Inc → SOONER ROAD PIT; 1984-03-07 to 1997-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Joe D  Stevens → SOONER ROAD PIT; 1984-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe D  Stevens → Quality Sand & Gravel Inc; 1984-03-07 to 1997-08-31; source msha-controller-operator-history
- **operator_operates_mine:** General Materials Inc → SOONER ROAD PIT; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry H  Lemon  et al → General Materials Inc; 1997-09-01 to 2009-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth K  Wert → SOONER ROAD PIT; 2009-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth K  Wert → General Materials Inc; 2009-12-04 to current/open; source msha-controller-operator-history