# Relationship history for MSHA mine 1201704

Current hierarchy: **Wayne  Klink JR → State Line Sand & Gravel Inc → 68 Plant**

- 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

- **controller_controls_mine:** Old Fort Industries Inc → 68 Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Klink JR → 68 Plant; 1978-11-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Aggregates Corp → 68 Plant; 1979-01-01 to 1981-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Old Fort Industries Inc → Midwest Aggregates Corp; 1979-01-01 to 1981-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Old Indian Materials Corp → 68 Plant; 1981-08-28 to 1985-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Harmening Edwin V → 68 Plant; 1981-08-28 to 1985-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Harmening Edwin V → Old Indian Materials Corp; 1981-08-28 to 1985-04-29; source msha-controller-operator-history
- **operator_operates_mine:** State Line Sand & Gravel Inc → 68 Plant; 1985-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Klink JR → State Line Sand & Gravel Inc; 1985-04-30 to current/open; source msha-controller-operator-history