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DE744329C
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Drilling machine with a headstock that can be adjusted by a motor drive and locked in its respective position
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GB512294A
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Tool or blank feeding mechanism for machine tools, particularly drilling machines
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GB513408A
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Tool or blank feeding mechanism for machine tools, particularly drilling machines
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DE731809C
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Drill with manual feed and automatic return device for the drilling spindle
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GB464177A
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Variable-speed friction gearing
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GB419698A
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Twist drill, and method and device for grinding twist drills
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DE720563C
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Machine used for relief grinding the cutting back surfaces of twist drills
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GB262641A
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Improvements in and relating to machines for drilling metal and the like
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