T020, Develop Mines《开发矿业》

Stamp Title: Develop Mines
Serial number: T20
Values in set: 4
(4-1), A new mine, 4 fen, 40*30 mm
(4-2), Coal mining, 8 fen, 40*30 mm
(4-3), Open-pit mining, 10 fen, 40*30 mm
(4-4), Transportation under grand, 20 fen, 40*30 mm
Date of issue: December 29, 1978
Denomination: 42 fen
Designer: Shao Boling
Engraver: Gao Pinzhang, Sun Hongnian, Li Qingfa, Jiang Weijie
Size of stamps: 40*30mm
Perforation: 11*11.5
Sheet composition: 50(5*10)
Printing process: Engraving and photogravure
Printing House: Beijing Postage Stamp Printing Works

: (4-1), A new mine, 4 fen, 40*30 mm

: (4-2), Coal mining, 8 fen, 40*30 mm

: (4-3), Open-pit mining, 10 fen, 40*30 mm

T20 开发矿业
（1） 4分群众报矿 1000万枚
（2） 8分掘进尖兵 1000万枚
（3）10分露天采矿 1000万枚
（4）20分井下运输 1000万枚
发行日期：1978.12.29。影雕套印。P11×11.5。40mm×30mm。50(5×10)。[G]。[D]邵柏林。[E]高品璋、孙鸿年、李庆发、姜伟杰。印刷：北京邮票厂。