for control of an electrical or electro-hydraulic copying system

Full Title

Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually > using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor > Feelers; Feeler units > designed for a physical contact with a pattern or a model > for control of an electrical or electro-hydraulic copying system

Child Classifications

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• B23Q 35/32 in which the feeler makes and breaks an electrical contact or contacts, e.g. with brush-type tracers
• B23Q 35/34 in which the feeler varies an electrical characteristic in a circuit, e.g. capacity, frequency