# Relationship history for MSHA mine 4404943

Current hierarchy: **James  Taylor; Coy  Taylor → Pioneer Coal Corp → Toby Jon No 4 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Collins Ted → Toby Jon No 4 Mine; 1977-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Coal Corp → Toby Jon No 4 Mine; 1978-02-01 to 1978-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Collins Ted → Pioneer Coal Corp; 1978-02-01 to 1978-10-18; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Coal Corp → Toby Jon No 4 Mine; 1978-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Taylor et al → Toby Jon No 4 Mine; 1978-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Taylor et al → Pioneer Coal Corp; 1978-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coy  Taylor et al → Pioneer Coal Corp; 1978-10-19 to current/open; source msha-controller-operator-history