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30 Wakley Street 47 Vyse Street A. A. OSBORNE ft ADVERTISEMENTS ammonium chloride anode Ashford Avia electronic balance staff balance wheel BEECH Birmingham brass British Horological Institute calendar mechanism cell or battery centre wheel chuck circuit clearance Clerkenwell Road click spring Clockmakers Clocks and Watches coil dial diameter drilled Ebauches electronic module electronic with calendar filing fitted fly cutters ft SONS LTD hole honed HOROLOGICAL JOURNAL jeweller JEWELLERY REPAIRS Kent Lantern Clock lathe mandrel lathe tool London magnet manganese dioxide manufactured March material mercury cell Merseyside minute wheel MODELS motor mounting plate movement Nottingham operation ORIS ORPINGTON oscillator plastics plated steel ponents potassium hydroxide potassium hydroxide electrolyte primary cell printed circuit board quartz crystal Roamer s/day screws shown in Fig silver steel slip washer space STAINTONS Swanley Telephone TICK TICK TICK tool tooth form tooth width voltage Wakley Street WATCH CLEANING watch repairs Watchmakers zinc carbon