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41. | a vest-pocket camera |
| 袖珍型 [小型] 相机 |
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42. | asynchronous phase splitter |
| 异步劈相机 |
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43. | twin lens reflex camera |
| 双眼反光相机 |
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44. | synchronous phase advancer |
| 同步进相机 |
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45. | panoramic reconnaissance camera |
| 全景侦察相机 |
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46. | step-and-repeat negative machine |
| 连拍照相机 |
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47. | tri-lens camera |
| 三镜头相机 |
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48. | synchronous capacitor |
| 同步调相机 |
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49. | ynchronous phase modulator |
| 异步调相机 |
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50. | synchronous phase shifter |
| 同步移相机 |
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