# Relationship history for MSHA mine 3401789

Current hierarchy: **Tommy  Caldwell → BLUEBIRD STONE → CAMERON PIT**

- 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:** Valley Stone → CAMERON PIT; 1995-08-01 to 2026-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Johnny M  Webb → CAMERON PIT; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnny M  Webb → Valley Stone; 1995-08-01 to 2026-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Tommy  Caldwell  et al → CAMERON PIT; 2007-12-19 to 2016-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Tommy  Caldwell → CAMERON PIT; 2016-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BLUEBIRD STONE → CAMERON PIT; 2026-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tommy  Caldwell  et al → BLUEBIRD STONE; 2026-07-15 to 2016-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Caldwell  et al → BLUEBIRD STONE; 2026-07-15 to 2016-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Tommy  Caldwell → BLUEBIRD STONE; 2026-07-15 to current/open; source msha-controller-operator-history