# Relationship history for MSHA mine 2002378

Current hierarchy: **Reid Jim → St Clair Sand & Gravel Inc → Plant 77-2**

- 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:** Genoak Materials Inc → Plant 77-2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** William Click Sand & Gravel Company → Plant 77-2; 1950-01-01 to 1982-12-27; source msha-controller-operator-history
- **controller_controls_mine:** Conlin Howard J → Plant 77-2; 1950-01-01 to 1982-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Conlin Howard J → William Click Sand & Gravel Company; 1950-01-01 to 1982-12-27; source msha-controller-operator-history
- **operator_operates_mine:** Tri-City Aggregates Inc → Plant 77-2; 1982-12-28 to 1983-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Genoak Materials Inc → Tri-City Aggregates Inc; 1982-12-28 to 1983-09-06; source msha-controller-operator-history
- **operator_operates_mine:** St Clair Sand & Gravel Inc → Plant 77-2; 1983-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reid Jim → Plant 77-2; 1983-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reid Jim → St Clair Sand & Gravel Inc; 1983-09-07 to current/open; source msha-controller-operator-history