# Relationship history for MSHA mine 4406440

Current hierarchy: **Bolling Betty S & Robert → J & R Contractors Inc → No 1 Strip**

- 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:** J & R Contractors Inc → No 1 Strip; 1988-01-01 to 1988-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Marshall Jerry → No 1 Strip; 1988-01-01 to 1988-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Marshall Jerry → J & R Contractors Inc; 1988-01-01 to 1988-08-22; source msha-controller-operator-history
- **operator_operates_mine:** J & R Contractors Inc → No 1 Strip; 1988-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bolling Betty S & Robert → No 1 Strip; 1988-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bolling Betty S & Robert → J & R Contractors Inc; 1988-08-23 to current/open; source msha-controller-operator-history