# Relationship history for MSHA mine 2300174

Current hierarchy: **Joseph M  Briscoe → Ray & Briscoe Inc → R-B 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:** Joseph M  Briscoe → R-B QUARRY #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lincoln Quarry → R-B QUARRY #2; 1978-03-09 to 1994-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Claude T  Presley et al → R-B QUARRY #2; 1978-03-09 to 1994-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Claude T  Presley et al → Lincoln Quarry; 1978-03-09 to 1994-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Ray & Briscoe Inc → R-B QUARRY #2; 1994-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph M  Briscoe → Ray & Briscoe Inc; 1994-04-11 to current/open; source msha-controller-operator-history