# Relationship history for MSHA mine 0901072

Current hierarchy: **Johnson John N → Blue Mist Quarries → BLUE MIST QUARRIES**

- 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:** Stephen L  Adams  et al → BLUE MIST QUARRIES; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adams Granite Quarry → BLUE MIST QUARRIES; 1993-04-01 to 1996-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Stephen L  Adams  et al → Adams Granite Quarry; 1993-04-01 to 1996-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Adams  et al → Adams Granite Quarry; 1993-04-01 to 1996-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Blue Mist Quarries → BLUE MIST QUARRIES; 1996-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson John N → BLUE MIST QUARRIES; 1996-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson John N → Blue Mist Quarries; 1996-01-23 to current/open; source msha-controller-operator-history