组件和减速机中的ReactJs未定义错误

我的ReactJs应用程序中有一个“no unde”问题,控制台说:

• 未捕获参考错误:设备行未定义设备 18号线和21号线。

这是我写的代码:

组件(…组件/设备.js):

import React, { Component } from 'react';
import {connect} from 'react-redux';


class Equipment extends Component {
  render() {
    return (
      <div>
        {this.props.equipment.map(note => (
          <div className="card">
            <div className="card-header">
              Equipment
            </div>
            <div className="card-content">
              <table>
                <tbody>
                  <tr>
                    <td>{equipment.identifier}</td>
                  </tr>
                  <tr>
                    <td>{equipment.location}</td>
                  </tr>
                </tbody>
              </table>
              <button>edit</button><button>delete</button>
            </div>
          </div>
        ))}
      </div>
    )
  }
}

const mapStateToProps = state => {
  return {
    equipment: state.equipment,
  }
}

const mapDispatchToProps = dispatch => {
  return {
  }
}


export default connect(mapStateToProps, mapDispatchToProps)(Equipment);

const initialState = [
  {
    equipment:  [
      identifier: "My Machine 1",
      location: "My Location 1"
    ]
  }
];


export default function equipment(state=initialState, action) {
  switch (action.type) {
    default:
      return state;
  }
}

你知道错误在哪里吗? 谢谢您。