| NAME | MATCH NR. |
DESCRIPTION |
| Raak Energy saving lamps | 5316 | Log/tech slide chart of cardboard, 280x90x2 mm Front Scales: See Picture, Back Scales: See Picture |
| Raboma boorschijf | 2229 | Technical disc of plastic, 90x1 mm |
| Rabone & Sons Early model | 5096 | Generic slide rule of wood/metal, 2 feet mm Front Scales: scale 1/3 (1-33) [ A = CF A = B ] #scale 1/2 (1-22.5) and scale 1/4 (1-43) Back Scales: = on slide L = on body 12inch |
| Rabone & Sons Sector Made in England for Keuffel & Esser | 5097 | Sector of ivory, twice 305 mm Front Scales: 24inch Back Scales: See Picture |
| Racing research associates The Harvard Concentric Converter | 5043 | Disc |
| Radiac Calculator ABC - M1A1 | 5065 | Military disc |
| Ralo Calculator | 2230 | Log/tech slide rule of all wood, 137x38x10.5 mm Front Scales: E = C B = D |
| Rapidus Rechenscieber | 3663 | Generic slide rule of paper/wood, 150x29.5x7 mm Front Scales: K A = B CI C = D L |
| RCA 551 | 3888 | Generic slide rule of plastic, 176x28x7.5 mm Front Scales: K A = B S T C = D DI Back Scales: DF = CF CI C = D L |
| Rechengerät RG 44 German | 2077 | Military disc of plastic, 210x425x7 mm Front Scales: 1) 2) |
| Reddaway Belting and Pulley Calculator | 2767 | Log/tech slide rule of cardboard, 161x36x3 mm Front Scales: 4 scales |
| Reed Service Electronic Engineers | 2232 | Generic slide rule of wood/plastic, 298x42x13 mm Front Scales: 10inch / K A = B CI C = D L ] 26cm #D/L#, Back Scales: = S S&T T = |
| Reliance | 3868 | Generic slide rule of wood/plastic, 300x35x13 mm |
| Remix EMO Elektromodul Budapest | 5412 | Electrical disc of cardboard, 141x1 mm Front Scales: Items = C U Ø Back Scales: Items = V U F C % |
| Reyners Environmental Systems | 5280 | Log/tech slide chart of cardboard, 212x121x2.4 mm Front Scales: See Picture, Back Scales: See Picture |
| RHEI-TA Rechenstabe | 1994 | Generic slide rule of plastic, 280x33.5x5 mm Front Scales: A = B CI C = D K, Back Scales: = S L T = |
| Richardson 1917 | 2266 | Nautical slide rule of wood/plastic, 458x51x9 mm (1917) Front Scales: 1) = 2) 3) = 4), Back Scales: = 5) 6) = |
| Richter Rietz 11 | 3284 | Generic slide rule of plastic, 149x33x4 mm Front Scales: 13cm / K A = B CI C = D L Back Scales: = S S&T T = |
| Ricoh 1051 S | 5669 | Generic slide rule, 320x41x7 mm Front Scales: K A = B S T1 T2 C = D DI Back Scales: LL1 L DF = CF CIF CI C = D LL3 LL2 |
| Ricoh 151 | 5672 | Generic slide rule, 351x47x7 mm Front Scales: LL0 L K A = B S ST T C = D DI P LL0, Back Scales: LL1 LL2 LL3 DF = CF CIF CI C = D LL3 LL2 LL1 |
| Rietz 79 465 | 3283 | Generic slide rule of plastic, 149x31x3 mm Front Scales: 13cm / K A = B CI C = D L Back Scales: = S ST T = |
| Rista 1 Rietz | 2272 | Generic slide rule of plastic, 296x39.2x4 mm Front Scales: 27cm / K A = B CI C = D L Back Scales: = S S&T T = |
| Rista 11 Rietz | 2277 | Generic slide rule of plastic, 150x33x4 mm Front Scales: 13cm / K A = B CI C = D L Back Scales: = S S&T T = |
| Rista 2 Electro | 2273 | Electrical slide rule of plastic, 295x43x4 mm Front Scales: 27cm / Motor K A = B CI C = D Volt T S Back Scales: = LL1 LL2 LL3 = |
| Rista 3 Darmstadt | 2275 | Generic slide rule of plastic, 293x42x4 mm Front Scales: 27cm / L K A = B CI C = D P T S Back Scales: = LL1 LL2 LL3 = |
| Riva Kil-o-metre | 3910 | Technical disc of plastic, 74x14 mm |
| Roberts gauging | 2281 | Alcohol slide rule of all wood, 304x26x22 mm (Before 1824) Front Scales: Many scales, Back Scales: Many scales |
| Roberts gauging | 2282 | Alcohol slide rule of all wood, 304x26x22 mm (Before 1824) Front Scales: Many scales, Back Scales: Many scales |
| Röhm Ermittlung der Reitstockkraft | 5262 | Technical slide chart of plastic, 195x75x2 mm Front Scales: See Picture, Back Scales: See Picture |
| Rollprint Ltd. Cameron Flange | 2284 | Technical slide chart of cardboard, 210x96x1.6 mm (1948) |
| Roos SR - 104 Company | 3864 | Generic slide rule of all wood, 270x28x9 mm Front Scales: A = B CI C = D K, Back Scales: = S L T = |
| Rotoflow Turboexpander/compressor | 2288 | Log/tech slide chart of cardboard, 212x80x2 mm (1979) Front Scales: 9 scales Back Scales: 4 scales |
| Royal 1051 | 2290 | Generic slide rule of plastic, 331x44x4 mm Front Scales: 25cm DF = CF CIF CI C = D A K |
| Royal 1053 | 2291 | Generic slide rule of plastic, 330x44.9x3.6 mm Front Scales: L K A = B CI C = D S ST T Back Scales: 25cm = S LL2 LL3 = 8inch |
| Royal 1081 | 2293 | Generic slide rule of plastic, 330x45.2x3.6 mm Front Scales: T1 T2 A = B BI CI C = D P S ST Back Scales: LL1 LL2 LL3 DF = CF CIF CI C = D L K |