# Relationship history for MSHA mine 3608913

Current hierarchy: **John E  Preston → Preston and Preston Inc. → Preston Quarry #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:** John E  Preston → Preston Quarry #2; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preston & Preston Inc → Preston Quarry #2; 2001-03-01 to 2010-03-24; source msha-controller-operator-history
- **controller_controls_operator:** John E  Preston → Preston & Preston Inc; 2001-03-01 to 2010-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Ranwood Inc. → Preston Quarry #2; 2010-03-25 to 2014-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Cole → Preston Quarry #2; 2010-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Cole → Ranwood Inc.; 2010-03-25 to 2014-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Preston and Preston Inc. → Preston Quarry #2; 2014-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Preston → Preston and Preston Inc.; 2014-04-23 to current/open; source msha-controller-operator-history