# Relationship history for MSHA mine 1202026

Current hierarchy: **James R  Livengood → Martinsville Rockmakers, Inc. → MRI Sand & Gravel**

- 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:** Rogers Group Inc → MRI Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martinsville Sand & Gravel Inc → MRI Sand & Gravel; 1988-06-01 to 1989-03-22; source msha-controller-operator-history
- **controller_controls_mine:** John W  Jones → MRI Sand & Gravel; 1988-06-01 to 1989-03-22; source msha-controller-operator-history
- **controller_controls_operator:** John W  Jones → Martinsville Sand & Gravel Inc; 1988-06-01 to 1989-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Martinsville Sand & Gravel Inc → MRI Sand & Gravel; 1989-03-23 to 1995-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Robinson Kenton → MRI Sand & Gravel; 1989-03-23 to 1995-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Robinson Kenton → Martinsville Sand & Gravel Inc; 1989-03-23 to 1995-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc → MRI Sand & Gravel; 1995-10-31 to 2007-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc; 1995-10-31 to 2007-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Martinsville Rockmakers, Inc. → MRI Sand & Gravel; 2007-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James R  Livengood et al → MRI Sand & Gravel; 2007-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Livengood et al → Martinsville Rockmakers, Inc.; 2007-08-06 to current/open; source msha-controller-operator-history