# Relationship history for MSHA mine 2301995

Current hierarchy: **Harold E  Hibdon; Janet L  Hibdon → Hibdon Gravel, INC → Hibdon Gravel, INC**

- 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

- **operator_operates_mine:** Glen Hibdon → Hibdon Gravel, INC; 1988-07-01 to 1994-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Glen  Hibdon → Hibdon Gravel, INC; 1988-07-01 to 1994-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Glen  Hibdon → Glen Hibdon; 1988-07-01 to 1994-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Hibdon Gravel, INC → Hibdon Gravel, INC; 1994-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold E  Hibdon et al → Hibdon Gravel, INC; 1994-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Hibdon et al → Hibdon Gravel, INC; 1994-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janet L  Hibdon et al → Hibdon Gravel, INC; 1994-09-26 to current/open; source msha-controller-operator-history