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M104 (155 mm WP Smoke)
The M104 was a 155 mm white phosphorus (WP) smoke artillery projectile (shell), which was developed in the US around World War Two (WW2). The M104 was the designation for a family of three chemical projectiles, which are essentially the same other than their filling. The family included the M104 FS smoke, the aforementioned M104 WP smoke, and the M104 gas (chemical agent) projectiles. The M104 was closely related in form to the M102 and M11...
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