# Relationship history for MSHA mine 3607267

Current hierarchy: **Jeffrey  Harmon; Albert N  Shadle → J & A Coal Company → J & A Slope**

- 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:** Harman John E → J & A Slope; 1975-12-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hard & Shiney Coal Company Inc → J & A Slope; 1982-02-01 to 1986-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Harman John E → Hard & Shiney Coal Company Inc; 1982-02-01 to 1986-06-30; source msha-controller-operator-history
- **operator_operates_mine:** H W M Coal Company → J & A Slope; 1986-07-01 to 1988-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Morgan Carey-Edman Winand Et Al → J & A Slope; 1986-07-01 to 1988-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Carey-Edman Winand Et Al → H W M Coal Company; 1986-07-01 to 1988-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey  Harmon et al → J & A Slope; 1988-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & A Coal Company → J & A Slope; 1988-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey  Harmon et al → J & A Coal Company; 1988-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert N  Shadle et al → J & A Coal Company; 1988-11-08 to current/open; source msha-controller-operator-history