# Relationship history for MSHA mine 0404819

Current hierarchy: **Estate of Robert Jones → Foothill Materials, Inc. → HOGAN QUARRY**

- 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:** Al Johnson Construction Company → HOGAN QUARRY; 1984-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Claude C Wood Company → HOGAN QUARRY; 1986-07-01 to 1992-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Al Johnson Construction Company → Claude C Wood Company; 1986-07-01 to 1992-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Jones → HOGAN QUARRY; 1992-09-01 to 2014-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Foothill Materials, Inc. → HOGAN QUARRY; 1992-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Jones → Foothill Materials, Inc.; 1992-09-22 to 2014-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Robert Jones → HOGAN QUARRY; 2014-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Robert Jones → Foothill Materials, Inc.; 2014-01-08 to current/open; source msha-controller-operator-history