The business card for Divadata lists Dee MASON as Director with premises at 362 Bay Street. Small white business card with rounded corners & a photo of a bus advertising the company Divada. The company name is painted on the side bus which is in a Paris street with the Arc de Triomphe in the background.divadata, technology - computers, business & traders - digital technology, dee mason, bay street

Was purchased in 1974 at Eastern Office Supplies and was used by the donor for many years.OLYMPIA==> see also BRUMSVIGA + MONROE|The company started after the invention of the 'Pointing Typewriter' MIGNON by Friedrich v.Hefner-Alteneck, engineer of AEG (=ALLGEMEINE ELEKTRIZITAETSGESELLSCHAFT) in Berlin: In 1903 a company was founded to produce the >>MIGNON<<, the UNION SCHREIBMASCHINENGESELLSCHAFT. In 1923 the company moved to Erfurt and was renamed AEG DEUTSCHE WERKE. In 1930 it was renamed EUROPA SCHREIBMASCHINEN. Until the end of production in 1933, there were 49 different Font-Cylinders available. Their new typewriters were very successful under the name >>OLYMPIA<<, and in 1936 the company was renamed again OLYMPIA BUEROMASCHINEWERKE. In WWII the factory was destroyed. 'Leftovers' in Erfurt (East-Germany) became OPTIMA BUEROMASCHINEWERKE a GDR-run business - Former employees founded in Wilhemshaven (West-Germany) the new OLYMPIA WERKE under AEG share-holding. OLYMPIA's peak was in the 1970s when it was the largest producer of office machines in Germany. The rise of small-computers organization of Daimler-Benz/AEG/Olympia, the OLYMPIA branch was sold and the new owner in Asia formed the OLYMPIA INTERNATIONAL HOLDING LTD.Traveller De Luxe Portable Typewriter. Olympia (1973) Wilhemshaven Germany. German Qwerty Keyboard; pica 10cpi; 83cp; Black/White/Red ribbon; plastic case; Weight 11lbs/5kg.Purchased from Eastern Office Supplies, Railway Road, Blackburn.Olympia 1973commerce, office equipment / stationery

The Mark II Pilot Balloon Slide Rule was made of wood laminated with heavy white plastic with a length of 24.5-in. and width of 2.5 inches. Mark II rules were manufactured in Australia by W & G (Melbourne). The W & G rule differs only slightly from the English A. G. Thornton LTD rule. The W & G rule uses serif fonts and has some fiducial marks that the English rule lacks. Exact dates of production are not known but the MK II is known to have started production by 1927. The printed scales are engraved in the plastic faces. The slide rule has 4 captive cursors (glass windows and brass guides) that ride in slots on the top and bottom edges. Each can be moved independently of one another. The cursors are missing from this item. Brass knobs at both ends of the slide facilitate its movement. The case is fabric covered wood with felt lining. No known history for this item as located in a property after purchase. The Pilot Balloon slide rule is used to convert the observed azimuth and elevation readings into wind velocity and direction records. The use of slide rules was abandoned with the wide spread adoption of computers and programs to do the calculations, as well as the decline in the use of optical pilot balloon theodolites.Made in Australia by White & Gillespie (Melb) Pty Ltd. Established in 1910, the firm was involved mainly in printing plate manufacture, but during the Second World War it manufactured a variety of navigational aids and range finding devices for the military. About 250,000 instruments were made during that period. After the war the company produced, among other items, drawing instruments and slide rules. The long narrow case is fabric covered wood with felt fabric lining containing a long black laminate ruler with numerous white markings and numbers. Top of the ruler is in three sections with the centre section movable by small gold metal knobs at either end. This slide rule contains a engraved notation on the rear face "IMPORTANT. NORMALLY NUMBER OF GRATICULE SCALE DIVISIONS PER RADIAN (K) X LENGTH OF TAIL IN FEET (I) = 12X 105. IN OTHER CASES MULTIPLY GRATICULE READINGS BY 1.2/KI BEFORE CALCULATION ON RULE" Top of Slide Rule - RAAF Ident No G268/480 Serial WG/22pilot balloon slide rule, raaf