# Relationship history for MSHA mine 4607137

Current hierarchy: **Davis James O → J D Ca-Mont Inc → No 1**

- 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

- **controller_controls_mine:** Maynard Raymond L → No 1; 1985-07-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Knob Mining Inc → No 1; 1986-06-01 to 1987-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Maynard Raymond L → Blue Knob Mining Inc; 1986-06-01 to 1987-03-09; source msha-controller-operator-history
- **operator_operates_mine:** J D Ca-Mont Inc → No 1; 1987-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis James O Et Al → No 1; 1987-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis James O Et Al → J D Ca-Mont Inc; 1987-03-10 to current/open; source msha-controller-operator-history