# Relationship history for MSHA mine 3402145

Current hierarchy: **Tommy  Caldwell → BlueBird Stone → Spears 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

- **controller_controls_mine:** Danny  Caldwell  et al → Spears Pit; 2007-12-19 to 2016-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Stone LLC → Spears Pit; 2014-09-08 to 2016-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Johnson → Spears Pit; 2014-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Johnson → Johnson Stone LLC; 2014-09-08 to 2016-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Tommy  Caldwell → Spears Pit; 2016-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BlueBird Stone → Spears Pit; 2016-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Caldwell  et al → BlueBird Stone; 2016-06-02 to 2016-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Tommy  Caldwell  et al → BlueBird Stone; 2016-06-02 to 2016-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Tommy  Caldwell → BlueBird Stone; 2016-06-02 to current/open; source msha-controller-operator-history