# Relationship history for MSHA mine 3608789

Current hierarchy: **Jarod S Johnson → Johnson Quarries → Norton 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

- **operator_operates_mine:** John Norton → Norton Quarry; 1999-06-01 to 2015-07-06; source msha-controller-operator-history
- **controller_controls_mine:** John  Norton → Norton Quarry; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Norton → John Norton; 1999-06-01 to 2015-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Quarries → Norton Quarry; 2015-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jarod S Johnson → Norton Quarry; 2015-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jarod S Johnson → Johnson Quarries; 2015-07-07 to current/open; source msha-controller-operator-history