helical-worm gear units
{"Image ImageWidth": "900", "Image ImageLength": "900", "Image BitsPerSample": "[8, 8, 8]", "Image PhotometricInterpretation": "2", "Image SamplesPerPixel": "3", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "www.meitu.com", "Image DateTime": "2015:03:18 14:47:29", "Image ExifOffset": "540", "Image XPTitle": "[116, 0, 111, 0, 119, 0, 101, 0, 114, 0, 32, 0, 99, 0, 114, 0, 97, 0, 110, 0, 101, 0, 32, 0, 103, 0, 101, 0, 97, 0, 114, 0, 101, 0, 100, 0, 32, 0, 109, 0, 111, 0, 116, 0, 111, 0, 114, 0, 0, 0]", "Image XPComment": "[119, 0, 111, 0, 114, 0, 109, 0, 32, 0, 103, 0, 101, 0, 97, 0, 114, 0, 32, 0, ... ]", "Image XPAuthor": "www.guomaodrive.com", "Image XPKeywords": "[116, 0, 114, 0, 97, 0, 110, 0, 115, 0, 109, 0, 105, 0, 115, 0, 115, 0, 105, 0, ... ]", "Image XPSubject": "[84, 0, 82, 0, 65, 0, 78, 0, 83, 0, 77, 0, 73, 0, 83, 0, 83, 0, 73, 0, 79, 0, 78, 0, 32, 0, 68, 0, 82, 0, 73, 0, 86, 0, 69, 0, 83, 0, 0, 0]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "706", "Thumbnail JPEGInterchangeFormatLength": "6059", "EXIF ExifVersion": "0221", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "800", "EXIF ExifImageLength": "800"}