# Relationship history for MSHA mine 3609012

Current hierarchy: **Luis F Vasquez Sanchez → FERNANDO VASQUEZ → KARP 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:** James W. Barber → KARP QUARRY; 2001-09-01 to 2017-03-06; source msha-controller-operator-history
- **controller_controls_mine:** James W  Barber → KARP QUARRY; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Barber → James W. Barber; 2001-09-01 to 2017-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Fernando Vasquez → KARP QUARRY; 2017-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Luis F Vasquez Sanchez → KARP QUARRY; 2017-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luis F Vasquez Sanchez → Fernando Vasquez; 2017-03-07 to current/open; source msha-controller-operator-history