# Relationship history for MSHA mine 1601226

Current hierarchy: **James Troy → Troy James Sand & Gravel → PIT #3**

- 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:** James Troy → PIT #3; 1987-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burns Sand & Gravel → PIT #3; 1991-06-01 to 1993-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Burns Franklin → PIT #3; 1991-06-01 to 1993-09-02; source msha-controller-operator-history
- **controller_controls_operator:** Burns Franklin → Burns Sand & Gravel; 1991-06-01 to 1993-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Troy James Sand & Gravel → PIT #3; 1993-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Troy → Troy James Sand & Gravel; 1993-09-03 to current/open; source msha-controller-operator-history