# Relationship history for MSHA mine 4604419

Current hierarchy: **Skelton L R & Company → L R Skelton & Co → No 1 Strip Mine**

- 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:** Carl J Martin → No 1 Strip Mine; 1974-01-01 to 1974-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Martin Carl J → No 1 Strip Mine; 1974-01-01 to 1974-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Martin Carl J → Carl J Martin; 1974-01-01 to 1974-08-30; source msha-controller-operator-history
- **operator_operates_mine:** L R Skelton & Co → No 1 Strip Mine; 1974-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Skelton L R & Company → No 1 Strip Mine; 1974-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skelton L R & Company → L R Skelton & Co; 1974-08-31 to current/open; source msha-controller-operator-history