# Relationship history for MSHA mine 3609526

Current hierarchy: **Shawn L  Adams → Shawn Adams → Northrup 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:** Shawn L  Adams → Northrup Quarry; 2005-05-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shedden Quarry → Northrup Quarry; 2007-05-31 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth D  Shedden → Northrup Quarry; 2007-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth D  Shedden → Shedden Quarry; 2007-05-31 to 2008-03-31; source msha-controller-operator-history
- **operator_operates_mine:** T. G. Mountain Stone → Northrup Quarry; 2008-04-01 to 2015-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Charles  God et al → Northrup Quarry; 2008-04-01 to 2013-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Charles  God et al → T. G. Mountain Stone; 2008-04-01 to 2013-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Jan  Tuttle et al → T. G. Mountain Stone; 2008-04-01 to 2013-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Jan M  God → Northrup Quarry; 2013-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jan M  God → T. G. Mountain Stone; 2013-09-25 to 2015-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Shawn Adams → Northrup Quarry; 2015-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shawn L  Adams → Shawn Adams; 2015-06-30 to current/open; source msha-controller-operator-history