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41. Optical mechanics

42. Optical mechanics

43. Optical mechanics

44. Optical mechanics

45. Optical mechanics

46. Optical mechanics

47. Optical mechanics

48. Optical mechanics

49. Optical mechanics

50. Optical mechanics

51. Optical mechanics

52. Optical mechanics

53. Optical mechanics

54. Optical mechanics

55. Optical mechanics

56. Secretarial work

57. Secretarial work

58. Switchboard operating

59. Switchboard operating

60. Typewriter repair