This is the relay board for a PIC microcontroller driven resistor decade box.

PCB low resistance:

3   1K   R22, R23, R24

1   1K8   R26

3   1R   R1, R2, R3

1   1R8   R5

1   2K2   R25

1   2R2   R4

1   3K3   R28

1   3R3   R7

1   4K7   R27

1   4R7   R6

3   10R   R8, R9, R10

1   18R   R12

1   22R   R11

1   33R   R14

1   47R   R13

3   100R   R15, R16, R17

1   180R   R19

1   220R   R18

1   330R   R21

1   470R   R20

2   100nF   C1, C2

2   74HCT595   IC1, IC3

2   ULN2803   IC2, IC4

16   TQ2-24V   K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11, K12, K13, K14, K15, K16

PCB high resistance:

3   10K   R1, R2, R3

1   18K   R5

1   22K   R4

1   33K   R7

1   47K   R6

3   100K   R8, R9, R10

1   180K   R12

1   220K   R11

1   330K   R14

1   470K   R13

3   1M   R15, R16, R17

1   1M8   R19

1   2M2   R18

1   3M3   R21

1   4M7   R20

2   100nF   C1, C2

2   74HCT595   IC1, IC3

2   ULN2803   IC2, IC4

12   TQ2-24V   K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11, K12

More information can be found here: https://en.elektronicastynus.be/category/projects/measuring-equipment/resistor-decade-box/