OpenStreetMap Reprojection with ScaleLine Control

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<!DOCTYPE html>
<html>
  <head>
    <title>OpenStreetMap Reprojection with ScaleLine Control</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src=""></script>
    <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.4.4/proj4.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      proj4.defs('Indiana-East', 'PROJCS["IN83-EF",GEOGCS["LL83",DATUM["NAD83",' +
          'SPHEROID["GRS1980",6378137.000,298.25722210]],PRIMEM["Greenwich",0],' +
          'UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],' +
          'PARAMETER["false_easting",328083.333],' +
          'PARAMETER["false_northing",820208.333],' +
          'PARAMETER["scale_factor",0.999966666667],' +
          'PARAMETER["central_meridian",-85.66666666666670],' +
          'PARAMETER["latitude_of_origin",37.50000000000000],' +
          'UNIT["Foot_US",0.30480060960122]]');

      var map = new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: 'map',
        view: new ol.View({
          projection: 'Indiana-East',
          center: ol.proj.fromLonLat([-85.685, 39.891], 'Indiana-East'),
          zoom: 7,
          extent: ol.proj.transformExtent([-172.54, 23.81, -47.74, 86.46],
              'EPSG:4326', 'Indiana-East'),
          minZoom: 6
        })
      });

      map.addControl(new ol.control.ScaleLine({units: 'us'}));
    </script>
  </body>
</html>