# Relationship history for MSHA mine 3608625

Current hierarchy: **Robert J  Johnson Sr → Robert Johnson Flagstone, Inc. → LATINI 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:** Robert J  Johnson Sr → LATINI QUARRY; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Quarries → LATINI QUARRY; 1997-01-01 to 1998-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Jerry L  Johnson → LATINI QUARRY; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry L  Johnson → Johnson Quarries; 1997-01-01 to 1998-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Harkness Quarry → LATINI QUARRY; 1998-09-01 to 2017-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Harkness → LATINI QUARRY; 1998-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Harkness → Harkness Quarry; 1998-09-01 to 2017-09-06; source msha-controller-operator-history
- **operator_operates_mine:** Robert Johnson Flagstone, Inc. → LATINI QUARRY; 2017-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Johnson Sr → Robert Johnson Flagstone, Inc.; 2017-09-07 to current/open; source msha-controller-operator-history