# Relationship history for MSHA mine 1601105

Current hierarchy: **Bobby G  Johnson → Industrial Gravel Company Inc → Lone Pine 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Bobby G  Johnson → Lone Pine Pit; 1981-07-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Gravel Company Inc → Lone Pine Pit; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby G  Johnson → Industrial Gravel Company Inc; 1986-09-01 to current/open; source msha-controller-operator-history