# Relationship history for MSHA mine 3605926

Current hierarchy: **Metropolitan International Inc → B & R Contracting Company → B & R 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:** B & R Contracting Company → B & R Strip; 1975-10-31 to 1976-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Gray Ralph & Paul Sloan → B & R Strip; 1975-10-31 to 1976-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Gray Ralph & Paul Sloan → B & R Contracting Company; 1975-10-31 to 1976-12-07; source msha-controller-operator-history
- **operator_operates_mine:** B & R Contracting Company → B & R Strip; 1976-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Metropolitan International Inc → B & R Strip; 1976-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metropolitan International Inc → B & R Contracting Company; 1976-12-08 to current/open; source msha-controller-operator-history