# Relationship history for MSHA mine 3610226

Current hierarchy: **Andrew L  Bishop → Wysox Sand and Gravel → Luther Mills 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:** Andrew  Bishop et al → Luther Mills Quarry; 2012-06-15 to 2015-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Andrew L  Bishop → Luther Mills Quarry; 2015-04-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wysox Sand and Gravel → Luther Mills Quarry; 2018-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Bishop et al → Wysox Sand and Gravel; 2018-01-18 to 2015-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Andrew L  Bishop → Wysox Sand and Gravel; 2018-01-18 to current/open; source msha-controller-operator-history